In the early 20th century, Kuwait immensely declined in regional economic importance, mainly due to many trade blockades and the world economic depression. Before Mary Bruins Allison visited Kuwait in 1934, Kuwait lost its prominence in long-distance trade. During World War I, the British Empire imposed a trade blockade against Kuwait because Kuwait's ruler at the time, Salim Al-Mubarak Al-Sabah, supported the Ottoman Empire. The British economic blockade heavily damaged Kuwait's economy.