Which early 20th-century development is most clearly demonstrated in the photograph?
A. Increased efficiency through assembly-line practices
B. Nationwide distribution of manufactured products
C. The decline of working conditions for factory employees
O D. The weakening of relations between government and business

How did the united states respond when north vietnam attacked a us warship and sent troops to south vietnam in the early 1960s? a. the united states declined to assist south vietnam against the north. b. us leaders authorized south vietnam to invade north vietnam. c. the president did not sign the gulf of tonkin resolution. d. congress authorized the president to escalate the conflict.