Most financing for presidential campaigns comes directly from
a. federal grants. b.labor unions. c.political parties. d.foreign individuals.

In the United States, most financing for presidential campaigns comes directly from "political parties", although it should be noted that this comes from many individual donors. 

It has a lot of important invents that happend in history

In my honest opinion , i’d say franklin d roosevelt was a president that impacted our nation , i say this because fdr is voted among top three best us presidents and he was the longest serving president by 3 terms , usually presidents only supposed to have two terms increments of 4 years , equivalent to 8 years total before election time. and he established the fdic , through the 1933 banking act and he established the us , social security system , during his presidency, and established a national minimum wage , through the fair labor standards act , fdr led the allied coalition to victory in wwii and he played a major role in the creation of the united nations.