If you are asking about Trump not letting Muslims and other caste enter OUR country then this would be my answer: The United States was built off of freedom. Freedom of speech, freedom of press. The United States was about helping people who couldn't hel themselves. It was considered the 'Promise Land' to some who come form third-world countries.
Originated from China de printinpress came to Europe in the 14th century and was made popular by Johannes Gutenberg who printed the bible and made printing popular and possible in mass production.