1. In Upton Sinclair’s book, The Jungle, readers discover 1) The principles of the Food and Drug Act of 1906
2) The favorable treatment of immigrant workers
3) The unsanitary practices in meat packing industry
4) The political struggles of President Theodore Roosevelt

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Explanation:

the most famous of all the units fighting in cuba, the "rough riders" was the name given to the first u.s. volunteer cavalry under the leadership of theodore roosevelt. roosevelt resigned his position as assistant secretary of the navy in may 1898 to join the volunteer cavalry. the original plan for this unit called for filling it with men from the indian territory, new mexico, arizona, and oklahoma. however, once roosevelt joined the group, it quickly became the place for a mix of troops ranging from ivy league athletes to glee-club singers to texas rangers and indians.