Early civilizations changed their natural environment by :

Early humans changed their environment through the domestication of animals, hunting and irrigation, Wing said. ... Many may not realize how extensively early settlers changed the environment, mainly because of persisting beliefs that primitive societies kept the land intact and lived simply with nature

Explanation:

when world war i broke out across europe in 1914, president woodrow wilson proclaimed the united states would remain neutral, and many americans supported this policy of nonintervention. however, public opinion about neutrality started to change after the sinking of the british ocean liner lusitania by a german u-boat in 1915; almost 2,000 people perished, including 128 americans. along with news of the zimmerman telegram threatening an alliance between germany and mexico, wilson asked congress for a declaration of war against germany. the u.s. officially entered the conflict on april 6, 1917.

answer: a video that encourages an armed attack on the government.

explanation: it is a violent overthrow to the government.

hope this : )