13. 1848
Romanian revolutionaries meeting in Paris decide to coordinate uprisings in Wallachia and Moldavia, drafting a reform program including land redistribution and political rights.
14. 1855
A locomotive successfully crosses John Roebling’s new suspension bridge over the Niagara River, proving the structure can safely support railway traffic and marking a major engineering milestone.
15. 1862
The Confederate ironclad CSS Virginia attacks Union warships at Hampton Roads, destroying wooden vessels and ushering in a revolutionary new era of armored naval warfare.