Which u. s. action of the 1920s revealed that the u. s. government's foreign policy was not as isolationist as it appeared?

The U.S. action of the 1920s that revealed that the U.S. government's foreign policy was not as isolationist as it appeared was the U.S. participation in the Washington Naval Conference.

Explanation:

The U.S. was at the forefront of efforts at disarmament and reducing  the growth of naval tonnage during the 1920s and 1930s. The Washington Naval Conference took place in 1921-1922 and gathered the world's largest naval powers to discuss naval reductions and the tensions in Asia with Japan.

254.34

step-by-step explanation:

the formula for area of a circle is given by

a = pi * r^2

a = pi * 9^2

a = 81*pi

using 3.14 as an approximation for pi

a = 3.14*81

a = 254.34