Where are saudi arabia’s densest regions located ?

west-central or southwest of the country

Explanation:

Most Saudis live in the west-central or southwest of the country, within 150 km of the Red Sea. The densest concentration of Saudi Arabians live near the country's mountainous border with Yemen.

to protect the united states' role as a world leader, president truman wanted to prevent the soviet union from spreading communism beyond its post-world war ii boundaries. he declared that the united states must assist any nations struggling to prevent a communist takeover.