One way would be to limit who can receive a passport or visa to travel to another country and another would be at the entrance to the country they may not be admitted for example due to inadequate funds to live. In my case, when I travelled by bus from Costa Rica to Panama, the Panamanian authorities required that I either have a ticket out of the country or a return ticket back to San Jose, Costa Rica.
The main ethnic groups are White, African American, Native American, Alaska Native, Pacific Islander, Asian, and Native Hawaiian.
White=72.4%
African American=12.6%
Asian=4.8%
Alaska Native=0.9%
Native Hawaiian and other Pacific Islander=0.2%
Other 6.2%
Two or more races 2.9%
The 5 most languages spoken in the US are English, Spanish, Chinese, French, and Tagalog. But in all there are 25 languages spoken in the US. I am unsure of the percentages of those though.
Some high islands can supports people
Eloise degraded to a tropical storm because the land interaction, with deep convection over its center eroded. Furthermore,
B. The rivers were used to sustain life by growing crops and food and having an unlimited drinking supply.
