Which tactic did george creel, the head of the committee on public information, use to gain the support of us citizens for the war?

he promised job opportunities in the us military for african americans from southern states.

he promoted anti-german and pro-war propaganda through posters, movies, and booklets.

he used slogans such as "food will win the war" to conserve food for war efforts.

he urged congress to pass the selective service act to compel all able us citizens to enlist for draft.

Correct  He promoted anti-German and pro-war propaganda through posters, movies, and booklets.

Detail:

George Creel was appointed as head of the Committee of Public Information by President Woodrow Wilson.  Pres. Wilson created the committee by issuing Executive Order 2594 on April 13, 1917, just a week after the United States had declared war against Germany and entered into The Great War (which we now know as World War I).  

I've attached a sample image of one such "anti-German and pro-war propaganda" posters produced by the Committee of Public Information.

Creel's committee used not only posters, movies and books, but also leaflets, press releases and billboards.  It was a multi-media campaign. They even had 75,000 speakers who volunteered to be "Four Minute Men," giving 4-minute patriotic speeches at schools and public events.

your answer is

relations between the soviet union and the united states were driven by a complex interplay of ideological, political, and economic factors, which led to shifts between cautious cooperation and often bitter superpower rivalry over the years. the distinct differences in the political systems of the two countries often prevented them from reaching a mutual understanding on key policy issues and even, as in the case of the cuban missile crisis, brought them to the brink of war.

the united states government was initially hostile to the soviet leaders for taking russia out of world war i and was opposed to a state ideologically based on communism. although the united states embarked on a famine relief program in the soviet union in the early 1920s and american businessmen established commercial ties there during the period of the new economic policy (1921–29), the two countries did not establish diplomatic relations until 1933. by that time, the totalitarian nature of joseph stalin's regime presented an insurmountable obstacle to friendly relations with the west. although world war ii brought the two countries into alliance, based on the common aim of defeating nazi germany, the soviet union's aggressive, antidemocratic policy toward eastern europe had created tensions even before the war ended.

racism and segregation.