The second one. The canal helps ships stay on sea level
Florida took a lot of time becoming a state due to the fact that it faced the same dilemma as Missouri as it entered into the Union. They had to wait for a certain period of time to ensure that the balance between Free State and slave remains unbroken. They became a state when Iowa was admitted into the Union which was a free state which maintained the balance.
The principle of Yin and Yang is that all things exist as inseparable and contradictory opposites, for example, female-male, dark-light and old-young. The principle, dating from the 3rd century BCE or even earlier, is a fundamental concept in Chinese philosophy and culture in general.
The President's name was Andrew Johnson! In order to have him impeached the Senate had to be two-thirds majority! The vote was 35-19 to impeach him they were only lacking 1 single vote!
I hope I helped! :)
