Question

Why did Western nations become interested in Saudi Arabia during the twentieth century?

Saudi Arabia abandoned Islamic law.
The nation set up European-style courts.
The country was becoming more modern.
Oil was discovered on the Arabian peninsula.

Answer 1

Oil was discovered on the Arabian peninsula.

The major reason Western nations became interested in Saudi Arabia in the 20th century was the discovery and development of vast oil reserves (beginning in the 1930s), which created huge strategic and economic interest. The other options are not the primary cause.