During the 1990s and early 2000s, u. s. leaders were concerned about the development of nuclear weapons by which country?
china
afghanistan
north korea
saudi arabia

federal power is further limited with a system of checks and balances that gives each branch of government a measure of power over the others.

explanation:

- "the past is made of multitudinous items ranging from anything that can be collected, recollected or assessed to originate in the past. as such, the past is a gallimaufry of particulars that may not have been related in any way. however, the human mind seeks organization to understand concepts and other things. the human mind therefore seeks relationships in explaining and studying the past. history being a humanity, dictates that historians have to serve this human trait by bringing structure to details of the past. historians do this by creating interpretive frameworks that capture as many details as possible."

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