Who the government considered to be an “undesirable immigrant”?

Thus nativism has become a general term for opposition to immigration based on fears that immigrants will "distort or spoil" existing cultural values. In situations where immigrants greatly outnumber the original inhabitants, nativist movements seek to prevent cultural change.

2018 means 2018 ce or common era

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

ccp would be the answer : )

explanation: