题目选项分析

American citizens were not generally required to have passports for international travel until 1941; prior to that year Washington was reliant on specific immigration laws, such as the U.S. Chinese Exclusion Act, to regulate international travel.

American citizens were not generally required to have passports for international travel until 1941; prior to that year Washington was reliant on specific immigration laws, such as the U.S. Chinese Exclusion Act, to regulate international travel.