A major cause of antagonism toward the new immigrants who came to the United States after 1880 was the belief that they

A Major cause of antagonism toward the "new immigrants" who came to the United States after 1880 was the belief that they Competed with Americans for jobs as unskilled laborers. In the 1890s, calls for limiting immigration were largely the result of:

Explanation:

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.

2018 means 2018 ce or common era

there have been other eras too including bce, which included way more years.