In the u. s., the majority of today's immigrants are settling in second-tier cities such as instead of the traditional immigrant gateways.

Some of the fastest growing Second their metropolitan are Portland, Atlanta, Dallas, Austin, Minneapolis-St Paul.

In the 21st century, emigration continues to transform cities and countries worldwide. One-fifth of the world’s migrants live in the United States where the immigrant born residents now surpass 40 million, which makes up 13% of the nationwide population.

In distinction to more traditional destinations and patterns, the trends of 21st-century gateways developed in the new context for the cultural, industrial, and federal consolidation of immigrants. All of these places are facing fast-paced innovation that has wide-reaching influences on neighborhoods, institutions, workplaces, and local public coffers.

the factors that the economies of the muslim empires prosper were:

1- land trade routes-located between three continents  

2- sea trade routes

trade contributed to the spread of muslim empires, and with that islamic culture led to a growing feeling of internationalism resulted in the transfer of technology, science, and other cultural forms.