What led to increase wealth modernization and immigration in many Arab countries on Arabian peninsula in the early 1900s?

In the early 1900s, the discovery of oil in the Arabian Peninsula transformed the economies of many Arab countries, leading to increased wealth and modernization. The newfound oil revenue funded infrastructure projects, education, and healthcare, significantly improving living standards. Additionally, the demand for labor in expanding industries attracted a wave of Immigration, as workers from various countries sought employment opportunities. This period marked a significant shift in the region's social and economic landscape.