Why was the period after world war ii described as the “cold” war?

the dominoes began to fall. the surrender at appomattox took place a week later on april 9. while it was the most significant surrender to take place during the civil war, gen. robert e. lee, the confederacy's most respected commander, surrendered only his army of northern virginia to union gen. ulysses s. grant

explanation:

first it was savannah, then it was augusta, louisville, milledgeville, then atlanta.

i live in georgia.

-seth