Answer:
[tex][/tex] 1. The development of effective republics in the Americas was primarily influenced by geographical factors such as the vast territory of the United States, which allowed for the establishment of an expansive and diverse political system. Therefore, C the government of the United States, is the closest option.
2. Switzerland is a federal government with no individual head of state. Therefore, B is the correct option.
3. Bir Tawil continues to be a place of terra nullius because it is hard to get to and has few resources, which makes it unattractive for territorial claims. Therefore, A is the best description.
4. Self-determination is the process where people within a country decide what type of government they want to have. Therefore, A is the best option.
5. Perforated states, which completely surround another state, are the most rare state shape. Therefore, D is the correct option.