1847

1847 was a common year in the Gregorian calendar. In the Americas, the Mexican–American War continued, with major operations including the Battle of Buena Vista in February, the siege of Veracruz in March, the Battle of Cerro Gordo in April, and the fall of Mexico City in September, contributing to the United States' territorial gains that would shape the region's borders in the following years.

In Ireland, the Potato Famine persisted, with 1847 known as Black Forty-seven for widespread hunger and disease. Large-scale emigration to North America and Britain intensified, profoundly impacting Irish demography and the global diaspora.

In the western United States, the Latter Day Saint movement established a new center as Brigham Young led the first group of Mormon pioneers to the valley of the Great Salt Lake, arriving on July 24 and beginning settlement that would become Salt Lake City.

In the British Isles, Parliament passed the Factory Act of 1847, commonly called the Ten Hours Act, restricting the working day for women and young persons in textile mills to ten hours, a milestone in labor reform.

Elsewhere, the year saw ongoing global tensions and reform movements that would culminate in the revolutions of 1848 in Europe, leaving long-lasting political and social impacts.