The 1950s in Britain saw significant social, economic, and political changes in the aftermath of World War 2. The Labour party swept elections in 1945, ushering in the welfare state including the NHS. Britain struggled economically compared to other European nations and experienced immigration from the West Indies. Racial tensions rose, culminating in riots in Notting Hill in 1958. Britain developed its own nuclear weapons program during the Cold War and the nuclear disarmament movement began as the decade came to a close.