How did Angkor become an important kingdom?

Angkor became an important kingdom in Southeast Asia during the Khmer Empire (9th to 15th centuries) due to its strategic location, agricultural productivity, and advanced irrigation systems, which supported a large population. The kingdom thrived on trade, connecting with regions like India and China, and its rulers promoted Hinduism and later Buddhism, fostering rich cultural and artistic achievements. The construction of monumental temples, such as Angkor Wat, showcased the empire's wealth and architectural ingenuity, solidifying its status as a powerful center of influence in the region.