How did us president warren harding step away from the league of nations?
he demanded many new rules and regulations.
he declared an end to us membership in the league of nations.
he said the us would play a limited role in the league of nations.
he announced his support for an isolationist policy.

I believe the answer is: He announced his support for an isolationist policy.

Isolationist policy refers to a foreign policy which advocated the country to always take a neutral stand and choose not to involved in the matters of other countries. This isolationist policy is the main reason why United states was considered to be late in our decision join the world war 2 against Axis power

union blockade

explanation:

the union blockade in the american civil war was a naval strategy by the united states to prevent the confederacy from trading.

the blockade was proclaimed by president abraham lincoln in april 1861, and required the monitoring of 3,500 miles (5,600 km) of atlantic and gulf coastline, including 12 major ports, notably new orleans and mobile. those blockade runners fast enough to evade the union navy could only carry a small fraction of the supplies needed. they were operated largely by british citizens, making use of neutral ports such as havana, nassau and bermuda. the union commissioned around 500 ships, which destroyed or captured about 1,500 blockade runners over the course of the war.