1. [Insert the was MOST impactful change on the Native Americans here and explain] a.
2. [Insert the next impactful change here and explain)
3. [Insert the next impactful change here and explain]
4. [Insert the next impactful change here and explain]
5. [Insert the next impactful change here and explain]

Explanation:1-infectious Eurasian diseases  

2-attempts of assimilation (and Manifest Destiny)  

3-relocation attempt (Indian Removal Act of 1830)  

4-diminished food supply for nomadic tribes  

5-the introduction of horses and other animals to the new world (through the Columbian Exchange)

The correct answer is D) He established Social Security, which provided an income to older Americans.

The goal of this program was to help elderly American citizens survive the Great Depression. The Great Depression was an era in which millions of Americans lost their life savings and jobs. To combat this, President FDR created agencies through his New Deal Program. The Social Security agency became one of the most popular programs, as it not only helped elderly citizens but also helped individuals who were hurt on the job. This program still exists today.