Why did the untied states establish the open door policy? a to ensure that it could coduct trade with and exert influence in china. b to encourage immigration from china and others asian countries. c to allow us missionaries to travel freely in other countries d. to secure a lasting peace among the various imperial powers

The answer should be A. To ensure that it could conduct trade with and exert influence in China. There was a fear of control of China by other countries. The United States came up with the idea of the Open Door policy so that all countries could have a trade deal with China.

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- "a new era of american politics began with jackson's election in 1828, but it also completed a grand social experiment begun by the american revolution. nevertheless, jacksonian democracy represented a provocative blending of the best and worst qualities of american society."

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radioactive dating, also known as  radioisotope dating  is a process that in  estimating the approximate  age  of  rocks. these data can be analyzed from  the studies dealing with the  decay of the radioactive elements that are present in these rocks. in nature, there are a few types of materials or atoms which are quite unstable and they spontaneously decay or breakdown to form other kinds of atoms.