A few concerns were voiced regarding white adolescent girls forming relationships with men of colour, including South Asian seamen in the 1920s, Muslim immigrants in the 1920s to 1940s, African American GIs during World War II, Maltese and Cypriot cafe owners in the 1940s to 1950s, Caribbean immigrants in the 1950s to 1960s, and South Asian immigrants in the 1960s although the continuing record of mixed marriages and the later acceptance of successful mixed-race offspring in public and cultural life suggests tolerance at the time was the norm. But a recent ethnographic study argues that there are a number negative impacts despite the veneer of tolerance.