How did skateboarding go from LA to Uganda?

Chinese rappers in Shanghai. How did this happen?

Spatial diffusion: the spread of some phenomenon over space and through time from a limited number of origins.

Phenomena can include ideas, innovations, products, cultural traits, and contagious diseases.

1. Which is expansion diffusion, which is relocation diffusion?

2. Which type of expansion diffusion?

3. Which type of expansion diffusion?

4. Which type of expansion diffusion?

Tracking the AIDS Epidemic in the US An example of spatial diffusion

30 to 40 million people have died from AIDS worldwide, including 2 million in 2007.

33 million worldwide are currently infected with HIV/AIDS, of whom 2 million are children.

1% of all adults aged 15 to 49 in the world are living with HIV, including.6% of Americans.

2.7 million people contract HIV each year, or about 7,400 each day. Half of all people infected with HIV are women.

HIV’s origins can be traced to Africa; the first infection was a man in Kinshasa, Congo, in 1959.

HIV is devastating sub-Saharan Africa, where it is primarily spread among heterosexuals. In Botswana, 39% of the adult population is infected with HIV.

In Zimbabwe, a country of 13 million, more than 780,000 children have been orphaned by the AIDS epidemic.

In sub-Saharan Africa, 76% of the young people with HIV are female. They are four times more apt to contract AIDS through heterosexual sex, they progress to full-blown AIDS faster, and they die sooner.

In the US, it is believed that the first case entered via Haiti. It spread primarily among homosexual males and intravenous drug users.

Today we will trace the diffusion of AIDS through the US. In order to get to the website needed to complete the activity, you will need to first go to