"but lets not let our imaginations overrule the facts!"

And yet that is exactly what you did.

Obama did't impose economic sanctions, he applied sanctions aimed at specific individuals.

Banks don't deal with Venezuela  because they don't get paid. Multiple companies have pulled out because they are losing billions of dollars on overdue payments- Ford, GM, American Airlines, Air Canada, Colgate,..

Meanwhile Venezuelans are starving whilst Maduro's cronies loot the treasury and dine of Fois Gras, Caviar, - and buying mansions in Miami - until Obama put the sanctions on them.