The covenant that warrants against claims of third parties is quiet enjoyment
I thank that it is the Indian Removal Act.
Answer A. The legislature
Answer:
To sum everything up: Significant foreign aid, being one of two superpowers after WWII, having economic growth so people tolerated totalitarianism and finally manpower, resources and nuclear weapons (thanks to an extensive spy network) is what allowed the Soviet Union to grow so powerful.
Explanation: