Answer:
The us goverment used the domino theory as a justification for its involvement in the vietnam way. along with its support for non-communist dictator in southern vietnam
Explanation:
The first Europeans to arrive in North America -- at least the first for whom there is solid evidence -- were Norse, traveling west from Greenland, where Erik the Red had founded a settlement around the year 985.
Explanation:
B. The Wright brothers . . .

I believe they were all founded to preserve supplies for wartime.
Limits on U.S. and Soviet weapons (hence the title "Strategic Arms Limitation")