1917
Arabia
The US enters WW1 in 1917
No, the Sahara does not enter Saudi Arabia. It is strictly an African Desert.No, the Sahara does not enter Saudi Arabia. It is strictly an African Desert.
Some time near the end of WW3
The related link below will provide you with this information.
1914
April 6th, 1917
No, as of 2013, Jewish people are not permitted to enter Saudi Arabia.
Marines
If you mean WWll 1939, or for WW1 it was 1914.
Cerainly in WW1 it was involved in the sense that it was a part of Arabia which was a protectorate of Great Britain.