April 6 1917 is when the us joined its allies in the world war. We helped lead our allies mainly Britain and France to victory
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C) Zebulon Pike led the first expedition that explored the new purchased Louisiana territory. Specifically, Pike was sent out by Thomas Jefferson to explore and document the southern portion of the Louisiana Territory and to find the headwaters of the Red River. However, his expedition happened during the same time as the Lewis and Clark expedition.
It is either B or C I honestly believe the answer is B tho.
" It carried the natural resources of the West-minerals, timber, crops, and cattle-to eastern markets. In turn, trains brought miners, ranchers, and farmers west to develop these resources further. "
Source : jiskha.com
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I'm pretty sure is 2 but count on me but if you have to choose 2