Discrimination in Employment Act of 1967 and the Americans with Disabilities Act of 1990. There is no federal law banning all sexual orientation or identity discrimination, but 22 states had passed laws by 2016. These equality laws generally prevent discrimination in hiring, terms of employment, and make discharge because of a protected characteristic unlawful. There is no federal law against unjust discharge, and most states also have no law with full protection against wrongful termination of employment. Collective agreements made by labor unions and some individual contracts require people are only discharged for a "just cause". The Worker Adjustment and Retraining Notification Act of 1988 requires employing entities give 60 days notice if more than 50 or one third of the workforce may lose their jobs. Federal law has aimed to reach full employment through monetary policy and spending on infrastructure. Trade policy has attempted to put labor rights in international agreements, to ensure open markets in a global economy do not undermine fair and full employment. History Modern US labor law mostly comes from statutes passed between 1935 and 1974, and changing interpretations of the US Supreme Court. However, laws regulated the rights of people at work and employers from colonial times on. Before the Declaration of Independence in 1776, the common law was either uncertain or hostile to labor rights. Unions were classed as conspiracies, and potentially criminal. It tolerated slavery and indentured servitude. From the Pequot War in Connecticut from 1636 onwards, Native Americans were enslaved by European settlers. More than half of the European immigrants arrived as prisoners, or in indentured servitude, where they were not free to leave their employers until a debt bond had been repaid. Until its abolition, the Atlantic slave trade brought millions of Africans to do forced labor in the Americas. However, in 1772, the English Court of King's Bench held in Somerset v Stewart that slavery was to be presumed unlawful at common law. Charles Stewart from Boston, Massachusetts had bought James Somerset as a slave and taken him to England. With the help of abolitionists, Somerset escaped and sued for a writ of habeas corpus (that "holding his body" had been unlawful). Lord Mansfield, after declaring he should "let justice be done whatever be the consequence", held that slavery was "so odious" that nobody could take "a slave by force to be sold" for any "reason whatever". This was