1989 Event Hungary revises constitution 1983 Event Senate revises immigration laws, gives millions of illegal aliens legal status under an amnesty program 1982 Event Portugal revises constitution 1980 Event Angola revises its constitution 1978 Event Zaire revises constitution 1978 Event Angola revises its constitution 1975 Event Senate revises filibuster rule, allows 60 senators to limit debate 1972 Event Hungary revises constitution 1967 Event Tonga revises constitution 1930 Event Baseball Rules Committee greatly revises the rule book 1848 Event Johan Thorbeckes revises Great Force
