How many miles from the united states is cuba? whose colony was cuba?

Cuba is 90 miles from the United States. (90 miles from the Florida keys to be exact)

Cuba became a Spanish colony after Columbus had arrived. 

It is 90 miles/to be exact 103 miles.Cuba was a Spanish governors in Havana.

Interpreting the results of his experiment : )

They made a checks and balance system to equal power within the branches. the "check" meant that one branch would watch one branch and "balance" them if they were too powerful. if you want more info on this, i would just google checks and balance system.