Cuba has been a colony of Spain back in 1762.
(:
The answer is low unemployment they couldn't find jobs
I'm assuming because this is under the history thread, it's dealing with the U.S. Senate. There are two main political parties in the U.S. which are Democratic and Republican- but there is also an Independent party, just not as big. Representatives are people who represent a certain party in, I believe, the Senate. So when it says "proportional", it's most likely referring to the fact there is an equal amount of representatives who are under the two big parties- the Democratic or Republican.
There are three branches of government: legislative, judicial and executive. Each branch is given its own independent suites within the government. The first branch to act is the legislative, declaring that a law should be made through congress; such as creating a environmental law on certain type of animal. The second branch is judicial, which decide how this law is going to be enacted; such as putting a ban on capturing or harming said animal. And the third branch is executive, this branch has to give its consent on the legislative and judicial approaches before they can be enacted.
The only shape that fits that definition is the sphere. So, gravity is the answer to why Earth is round! If you've seen pictures of asteroids that exist in outer space, you may have noticed that some of them are irregular, rocky shapes. That's because they're not big enough to pull themselves into a sphere.