B. The Wright brothers . . .

The Olmec civilization was located in "MesoAmerica," since they were located in an area that is now part of present-day Mexico (although the borders are significantly different now).
The effect of foreign conflict on Americans support would be the War of 1812 where British captured Washington, D.C. and burned our White House, and also U.S. forces turn back a British attack on Baltimore. The good thing that came out of the conflict was gaining our "Star Spangled Banner" from Francis Scott Key.
Reactions to USSR using military force to make Eastern Europe communist ... was the only E. European nation that was communist without being a satellite.