There are theories on what caused the u. s.s. maine to explode while it sat in the havana harbor. what are they? a. spanish spies set fire to the gunpowder. b. cannons from shore batteries hit the ship. c. the battleship struck a mine. d. coal spontaneously combusted.

The theories that caused the U.S.S. Maine to explode while it sat in the Havana Harbor because they believe that Coal spontaneously combusted. It is believed that there were about 5 tons of ammunition on board.

1920 census

the census was scheduled for january the 1st, as the government believed that more farmers would be in their homes by that time instead of april. the census did not ask about unemployment, the number of children, and how long was a couple married were not taken into consideration. individuals were considered as residents of the places they normally slept, not the places were they worked at or visited.

2010 census

the census was scheduled for april 1st, 2010. it was the shortest census in history: it only contained 10 questions related to name, age, gender, ethnicity, relationship, and whether the citizen owned a home or rented one. the government launched a website in order to provide the citizens with information regarding the census. there were also "teach census weeks" in schools nationwide.

From mexican american war , us gained new mexico.