What did jacob riis do?
history~

map scale refers to the relationship (or ratio) between distance on a map and the corresponding distance on the ground. for example, on a 1: 100000 scale map, 1cm on the map equals 1km on the ground.

hitlers fav so e: jews

a. poison gas was sprayed over battlefields by airplanes to weaken enemy positions before major attacks.

the speech convinced americans that the ussr was an enemy, rather than an ally, which led to the creation of the truman doctrine.