Hey Jasmine812!
The Incas used khipu, the system of recording numbers by tying knots on strings! The numbers were indicated by knot type and position on the cord.
I hope this helps!
The Articles became very weak and were unable to do lots of things. Like for example draft army members and tax the states.
Did you ever find out the answer
I think that the US did have the right to prevent the spread of communism. Any nation that turned communist (except for Yugoslavia) turned out to be because the Soviets arranged it to threaten the US. For example; the Soviets used Cuba to place missiles in the Americas, and China used Vietnam to threaten NATO outposts in the South China Sea. Any nation that was communist was clearly aligned with the USSR, and determined to threaten the US.