Less than a month after just one mass shooting, New Zealand's Parliament voted 119-1 Wednesday to ban most military style assault rifles and semiautomatic weapons in the most sweeping changes to the country's gun laws in decades. The measure, passed after a white supremacist killed 50 people and wounded dozens more at two mosques in Christchurch, also includes a buyback program of existing weapons; lawbreakers can face a prison term of up to five years. During an expedited debate that swooped...