The United States feared that if communism was successful on Vietnam, the rest of the countries that border it would soon turn into communism and those other countries that border that new communist country would also be converted to communism and so on. This is called the "domino theory" and made the United States to send troops to prevent the theory from happening.
Ehm, Robert Fulton is best known for fully developing the first successful commercial steamboat.
Hope this helps ;p
The correct answer to this open question is the following.
The "best" tessellation design be found in architecture and different forms of art in Muslim temples, mesquites, buildings, and museums. They are considered the "best" due to spectacular and intricates formations. Indeed, their tessellations are a work of art. The three types of tessellations that can be found in those places are Reflection, Translation, and Rotation. Tessellations cover any kind of surface with different formations and have no overlaps or spaces.
Hamilton saw the judicial branch as the least dangerous branch because it had little to no impact on legislation, according to him. It had no power over money, like the Legislature, not power of the "sword", like the Executive. This would all change dramatically after the Marbury vs Madison case. Chief Justice John Marshall created the power of Judicial Review, leaving a lasting impact on the court and politics. The Court now had teeth and would use them to cut off and stop legislation that they found to be unconstitutional.