What details about the Boston
Massacre do A and B have in common?

I would recommend uploading an image of the document, but here is some information on the Boston Massacre for reference. The Boston Massacre was a deadly riot that occurred on March 5, 1770, on King Street in Boston. It began as a street brawl between American colonists and a lone British soldier, but quickly escalated to a chaotic, bloody slaughter. The conflict energized anti-British sentiment and paved the way for the American Revolution.

by 1880, germany had more rail lines than great britain and russia.