What action did jefferson do that may have been unconstitutional

The correct answer is the Louisiana Purchase.

While the President has the power to negotiate treaties, Jefferson likely got quite a bit ahead of himself when the land was purchased before the consent of the United States Senate.

Furthermore, the Federalists believed that the acquisition of territory itself might be unconstitutional.

your answer would be just capitalism.

on november 6 and 7, 1917 (or october 24 and 25 on the julian calendar, which is why the event is often referred to as the october revolution), leftist revolutionaries led by bolshevik party leader vladimir lenin launched a nearly bloodless coup d'état against the duma's provisional government.