Although the First World War increased world demand for tropical products and stimulated Guinea's economy, a post-war slump, and frequent political crisis created a deep recession. By the time of the 1926 military uprising in Portugal, most of Guinea was occupied, administered, and taxed, but its revenue was insufficient to pay for its administration, much less to expand it. When the Estado Novo imposed police on the Bissagos Islands in 1935–36 it completed its control of Guinea.