well many things happen in America during that time like for example gold was founded in California forming the gold rush in 1849
Peralta massacre happened in 1848.
Battle of Pákozd happened on 1848-09-29.
Battle of Bov happened on 1848-04-09.
I can not find any important advances in agriculture that occurred in 1848. John Deere's steel plow came about 10 years earlier as did the mechanical threshing machine.
In America, slavery.
Andrew Carnegie came to America in 1848 at the age of 12.
it was destroyed by the british in 1848.
The Mexican Cession was acquired in 1848 at the Treaty of Guadalupe Hidalgo.
Matale Rebellion happened in 1848.
Proclamation of Islaz happened in 1848.
Peralta massacre happened in 1848.
Wanganui Campaign happened in 1848.
Gold was discovered in America's west in 1848, causing the Gold Rush from 1848 to 1855. That is why San Fransisco, CA's football team is called the 49ers.
Westward Expansion/Manifest Destiny
people began moving west
Battle of Ramnagar happened on 1848-11-22.
Siege of Multan happened on 1848-04-19.