Was there an overall theme in the movies in the 1930s?

The 30s was also the decade of the sound and color revolutions and the advance of the 'talkies', and the further development of film genres (gangster films, musicals, newspaper-reporting films, historical biopics, social-realism films, lighthearted screwball comedies, westerns and horror to name a few).

:))

the tariff was created to protect industry in the northern part of the united states. industries in the north were being driven out of business by imported goods that were priced at a low rate. the goal was to protect these industries   by taxing the goods.

united states reinforcements contributed greatly to three allied victories in france at: cantigny (first major american battle), argonne (the largest in the united states military history, involving 1.2 million american soldiers), and château-thierry (one of the first actions under general pershing).