By ruling gently with religious tolerance new areas were easier to conquer with least resistance.
Explanation:
The Ottoman empire conquered vast expanses of territory. However, they usually did so while preaching religious tolerance. Far form affecting their results, this made their conquests more efficient. People were more willing to listen to them, and accept them, than they would have been otherwise. Moreover, they were also more willing to adopt some elements of Islamic culture and values, which made cultural diffusion more effective.
There were a number of predecessor agencies to INS between 1891 and 1933. The Immigration and Naturalization Service (INS) was formed in 1933 by a merger of the Bureau of Immigration and the Bureau of Naturalization. Both those Bureaus, as well as the newly created INS, were controlled by the Department of Labor.