After the louisiana purchase there was an area of the land between the u. s and the new spain that neither country controlled. this area was called area 51 no mans land atlantis or neutral ground

neutral ground.

Explanation:

Area 51 is in Nevada and Atlantis was never found.

the federalist party which advocated strong centralization dominated the united states government till 1800. so 1800 election transformed the power from one party to another party for the first time and was thus a turning point in american history. so jefferson called it "revolution of 1800".

explanation:

. political or economical policy that isolates a country from participating in international relationships. it has been suggested that the united states participates in isolationism because of its lack of involvement in particular wars or alliances.