Answer: Its "D"
Explanation:
the answer is D due to lakes rivers and mountains being natural barriers. Which in turn creates a boundary between to states or countries.
Answer: In post-revolutionary Russia, the Union of Soviet Socialist Republics (USSR) is established, comprising a confederation of Russia, Belorussia, Ukraine, and the Transcaucasian Federation (divided in 1936 into the Georgian, Azerbaijan, and Armenian republics).
Explanation:
The statement that best describes 21st-century migration flow to the United States is that l<span>arge numbers of immigrants and migrant workers, including skilled and unskilled , are coming to the United States from South and Central America</span>
Tender warm atmosphere, wonderful scenes, a genuinely very much created tourism framework, and shabby costs add to this. Some prominent resort urban communities in the southern Pacific Coast incorporate Acapulco, Huatulco, Puerto Escondido and Ixtapa-Zihuatanejo.
Note, nonetheless, that the most well known goal in Mexico is the "Mayan Riviera", alongside the Mexican Caribbean drift. It incorporates urban communities, for example, Isla Mujeres, Cancun, Cozumel, Playa del Carmen, and Tulum.