What factors contributed to the United States becoming a world leader?
A
the United States winning the war and having a strong economy
B.
the Allies winning the war and US having a skilled labor force
C
the United States winning the war and German scientists sharing their knowledge
OD. the United States suffering no war damage and having a strong economy

A.  The United States winning the war and having a strong economy.

Explanation:

The USA emerged as one of the great victorious powers of World War Two. Its soldiers fought in Asia, the Pacific and Europe, but not in the homeland. No battles ever took place on American soil. The war ended the Great Depression, the economy grew portentously , making the country reach its full industrial capacity and full employment. In 1945, the US economy represented 25% of the global GDP, more than another single country. So, the US became a world leader after WWII.

the perimeter of a triangle is 69 cm. side a is 5 cm shorter than side b. side c is twice as long as side a. find the length of each side. i need to know how to do it in 2 equations.  

equations:

a = b-5

c = 2a

a + b + c = 69