Final answer:
The events in chronological order are cash-and-carry policy, Lend-Lease Act, Pearl Harbor attack, and US declaration of war.
Step-by-step explanation:
The correct chronological order of the events leading up to America's entry into World War II is as follows:
The cash-and-carry policy allows the sale of arms to nations at war but only for cash.
The Lend-Lease Act allows Britain to buy arms from the United States on credit.
The Japanese air force attacks the US army base at Pearl Harbor.
The United States declares war on Japan.
The cash-and-carry policy was introduced in 1939 and the Lend-Lease Act was passed in 1941. Japan's attack on Pearl Harbor in December 1941 prompted the United States to declare war on Japan.