In recent years, Russia has advanced its military capabilities in the Arctic, reopening old military bases that had been abandoned following the collapse of the Soviet Union in 1991, and bolstering the Russian Navy's prestigious Northern Fleet that oversees operations and defense in the region.
Energy security is the association between national security and the availability of natural resources for energy consumption. Access to (relatively) cheap energy has become essential to the functioning of modern economies.
Answer:
the I think it's because of better educational and job prospects because in the rural areas people there have poor educational centres and some of the jobs don't give enough payment to support their families so they moved to the Urban areas where they can get better education and better jobs too
D. Puerto Rico.
Puerto Rico, while not a US state, is a US territory.
