Which river valley civilization has the biggest impact on us today?

Dalton developed the first model of the atom that showed the structure of the inside of an atom

The articles of confederation allowed congress to: make and borrow money. declare war. create a postal service. all of these choices are correct.

The 20th amendment, also called the lame duck amendment, decreased the amount of time between the presidential election and the inaugration of the new president. what are the advancements that allowed for this amendment?