2. Burying nuclear waste in Antarctica would be in violation of an international treaty.

3. Burying nuclear waste in Antarctica violated an international treaty.

4. When Rosa Parks was resistant to giving up her seat on the bus, she became a civil rights hero.

5. When Rosa Parks resisted giving up her seat on the bus, she became a civil rights hero.

6. The institution of the New Deal had to the effect of reversing some of the economic inequalities of the Great Depression.

7. The New Deal reversed some of the economic inequalities of the Great Depression.