Who's the 46th president in u. s. 1.bill clinton 2.barack obama 3.donald trump, 4bill clinton

We have only had 45 presidents. Technically, we have had 43 because Grover Cleveland is both the 22 and 24 president when he served 2 nonconsecutive terms. So, your question has no answer. I hope this helps!

Very useful. it is to learn because history repeats itself so learning about it those mistakes not happen again.