US History Since 1877

 Please provide a short to medium answer for this questions:

1 - The Bureau of Refugees, Freedmen and Abandoned Lands authorized by congress in March 1865. This organization's purpose was to:

2 - Lincoln believed that southern Unionists could become the nucleus of new, loyal state governments in the South. However, this is the only one of many proposed initiatives of his:

3 - Chinese railroad workers rebelled against the terrible conditions and went on strike to demand:

4 - Laws of incorporation passed in many states in the 1830's and 1840's, business organizations could raise money by:

5 - "Tongs" were a Chinese secret society involved in:

6 - Social Darwinism (survival of the fittest) argued that: