How many presidents are in the united states

45 (Including Donald Trump)

Explanation:

There have been 45 presidents in the United States, but however, due to today's political news (the possibility of Trump getting impeached), it might change to 46 quickly.

chronological thinking is an indispensable tool to structure a historical narrative and to give meaning to a sequence of events. the final section presents the results of a survey to test the chronological thinking of lower secondary school students carried out by the educational research institute.

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