The United States, like other nations, sets aside a number of days each year to commemorate events, people or public occasions. These holidays typically are marked by a general suspension of work and business activity, and by public and/or religious ceremonies.
Technically, the United States does not celebrate national holidays, but Congress has designated 10 “legal public holidays,” during which most federal institutions are closed and most federal employees are excused from work. Although the individual states and private businesses are not required to observe these, in practice all states, and nearly all employers, observe the majority of them.
Since 1971, a number of these have been fixed on Mondays rather than on a particular calendar date so as to afford workers a long holiday weekend.