1. Lesson 13.3b: War with Mexico
Today we will discuss the causes and the effects of the war with Mexico.

2. Vocabulary
cede – to give up or transfer ownership of something (especially land)
event – something that happens

3. Check for Understanding
What are we going to do today?
What is an event?
What does it mean to trace a series of events?

4. What We Already Know
In the 1840s, many Americans believe it was our nation’s manifest destiny to expand westward to the Pacific Ocean.

5. What We Already Know
American settlers in Texas fought for its independence and had asked to be added to the United States in 1836.

6. What We Already Know
Congress had voted against admitting Texas to the Union, partly because they did not want to risk war with Mexico.

7. In 1845, Congress annexed Texas as a slave state despite Northern objections.
Mexico still claimed Texas as its own and considered its admis-sion an act of war.
The border of Texas was in dispute.
With thousands of square miles at stake, Mexico was prepared to fight to defend its claim.

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9. 10. What did the United States do in 1845 that angered Mexico?
Admitted New Mexico as a state
Admitted Arizona as a state
Admitted California as a state
Admitted Texas as a state

10. President Polk made one attempt to find a peaceful solution to the problem.
Polk sent John Slidell, a Spanish-speaking ambassador, to Mexico.
Slidell offered $25 million for Texas, California, and New Mexico.
Mexico angrily rejected Slidell’s offer.

11. Polk decided to force the issue with Mexico.
He purposely ordered General Zachary Taylor to station troops on the northern bank of the Rio Grande.
Viewing this as an act of war, Mexico moved an army into place on the southern bank.

12. On April 25, 1846, a Mexican cavalry unit crossed the Rio Grande, ambushed an American patrol and killed or wounded 16 American soldiers.

13. Polk used this clash as an excuse for war.
Polk claimed “Mexico has invaded our territory and shed American blood upon American soil.”
Two days later, Congress declared war, and thousands of volunteers, mostly from western states, rushed to enlist in the army.

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15. How did Polk provoke a war with Mexico?
He sent troops to attack a Mexican village just north of the Rio Grande.
He arranged for ambassador Slidell to insult the Mexican president.
He sent troops into the disputed Texas border area.
He destroyed and American warship and made look as if Mexico had done it.

16. Americans had mixed reactions to Polk’s call for war.
Some, like Illinois representative Abraham Lincoln questioned the truthfulness of the president’s message and the need to declare war.
Many people were concerned about how many men might have to give their lives.

17. Americans had mixed reactions to Polk’s call for war.
Many Northeasterners saw the war as an excuse to spread slavery.

18. Americans had mixed reactions to Polk’s call for war.
Southerners saw expansion into Texas as an opportunity to extend slavery and to increase their power in Congress.

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20. 11. Why were some people opposed to the War with Mexico?
The war was fought over an event that may not have happened.
The war was an excuse to spread slavery.
Southerners believed the war could reduce their power in Congress.
Many worried about how many men would lose their lives in the war.
Which one doesn’t help answer the question?

21. General Stephen Kearny captured New Mexico.
Not long after the war began, Kearny and his men left Fort Leavenworth and marched 650 miles in six weeks to New Mexico.
The troops in New Mexico withdrew as Kearny’s forces approached, and Santa Fe fell without firing a shot.
Then Kearny and 300 soldiers marched on toward California.
The rest of his force moved south toward Mexico.

22. John C. Frémont led Californians to independence.
In California, Americans rebelled against Mexican rule in the Bear Flag Revolt.
They arrested the Mexican military commander and declared California independent of Mexico.
U.S. troops soon reached California and joined forces with the rebels.
Within weeks, Americans controlled all of California.

23. Defeating Mexico proved difficult.
The Mexican army was much larger than the American army.
Its officers had gained military experience during the Mexican Revolution.
It was fighting on home soil.
But the Americans were led by well-trained officers.

24. Get your whiteboards and markers ready!

25. Select all that are true!
712. Why should it have been difficult for the United States to defeat Mexico?
Mexico’s army was larger.
Mexico was fighting on its own soil.
Mexico’s officers had more wartime experience.
Mexico’s officers had better training.
Select all that are true!

26. American forces invaded Mexico from two directions.
General Zachary Taylor fought his way south from Texas toward the city of Monterrey in northern Mexico.
A second force led by General Winfield Scott landed at Vera Cruz on the Gulf of Mexico and battled inland toward Mexico City.

27. The Battle of Buena Vista
In February 1847, Zachary Taylor’s 4,800 troops met General Santa Anna’s 15,000 Mexicans near a ranch called Buena Vista.
After two days of bloody fighting, Santa Anna retreated, ending the war in the north of Mexico.

28. Winfield Scott battled toward Mexico City.
Scott’s force landed at Vera Cruz on the Gulf of Mexico.

29. Outside the capital, Scott met fierce resistance at the castle of Chapultepec.

30. About 1,000 Mexican soldiers and 100 young boys from a nearby military academy bravely defended the fortress.

31. Despite determined resistance, Mexico City fell to Scott in September 1847.

32. In February 1848, the war officially ended with the Treaty of Guadalupe Hidalgo.
In this treaty, Mexico recognized that Texas was part of the United States.
Mexico was forced to accept the Rio Grande as the border between the nations.

33. The Mexican Cession
Mexico also ceded a vast region known as the Mexican Cession.
Including Texas, this land made up almost one-half of Mexico.

34. The Treaty of Guadalupe Hidalgo
In return, the United States agreed to pay Mexico $15 million for the Mexican Cession.
The United States promised to protect the 80,000 Mexicans living in Texas and the Mexican Cession, and offered them citizenship if they chose.

35. Loss of the war and the loss of land left Mexico very bitter.
Many Mexicans felt that the United States had provoked the war in the hope of gaining Mexican territory.

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37. 13. What did each country agree to in the Treaty of Guadalupe Hidalgo?
Mexico recognized the Rio Grande as the Texas border.
The U.S. agreed to pay Mexico $15 million.
Mexicans living in the Mexican Cession would be protected by the U.S. government.
Slavery would not be permitted in the Mexican Cession.
Mexico would accept the annexation of Texas.
Which of one these is NOT true?

38. The Gadsden Purchase completed the continental United States.
The Gadsden Purchase was a strip of land across what is now southern New Mexico and Arizona.
The government wanted the land as a location for a southern transcon-tinental railroad.
In 1853, Mexico sold the land to the United States for $10 million.

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40. 14. Why did the United States acquire the Gadsden Purchase?
To complete the nation’s manifest destiny
To secure a new route for a railroad
To provide land for a new Indian Territory
To ease American guilt for forcing the Treaty of Guadalupe Hidalgo on Mexico
Select all that are true!

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42. 15. From what country did the United States acquire most of its southwestern region?
Britain
Spain
Mexico
France