17) what event led to truman's final decision to use the atomic bomb against japan? a) japanese attacks on nearby american ships b) the allies strength and number of victories c) japan's dismissal of the potsdam declaration d) the german surrender to allied forces in europe 18) which of these was a national political leader during world war ii? a) franz josef b) woodrow wilson c) winston churchill d) paul von hindenburg 19) the lend-lease act was an attempt by the united states to a) stay out of world war i. b) supply iron and oil to japan. c) divide land acquired from the mexican war. d) let england borrow weapons in the early 1940s. 20) which of these contributed to the crash of 1929 and the great depression? a) stock market speculation b) the effects of world war ii c) success of the u. s. farm economy d) foreign boycotts of u. s. products