Why most of the deserts are located in the western margins of continents in the subtopics?

Deserts are commonly found on the western margins of continents due to the presence of cold oceanic currents that create stable high-pressure systems, leading to dry air and little precipitation. Additionally, these areas are often in the rain shadow of mountain ranges, further reducing rainfall. The combination of these factors results in arid conditions and the formation of deserts in these regions.