What happened 15 April in United States of America

On April 15, Lincoln called on the states to send detachments totaling 75,000 troops to recapture forts, protect Washington, and "preserve the Union", which, in his view, remained intact despite the seceding states. This call forced states to choose sides. Virginia seceded and was rewarded with the designation of Richmond as the Confederate capital, despite its exposure to Union lines. North Carolina, Tennessee, and Arkansas followed over the following two months. Secession sentiment was strong in Missouri and Maryland, but did not prevail; Kentucky remained neutral. The Fort Sumter attack rallied Americans north of the Mason-Dixon line to defend the nation.

Luciano decided to eliminate Masseria (Lower Manhattan gang boss) . The war had been going poorly for Masseria, and Luciano saw an opportunity to switch allegiance. In a secret deal with Maranzano, Luciano agreed to engineer Masseria's death in return for receiving Masseria's rackets and becoming Maranzano's second-in-command. On April 15, Luciano invited Masseria and two other associates to lunch in a Coney Island restaurant. After finishing their meal, the mobsters decided to play cards. At that point, according to mob legend, Luciano went to the bathroom. Four gunmen then walked into the dining room and shot and killed Masseria.

The Palm Sunday massacre was a 1984 mass-murder in Brooklyn, New York, that resulted in the deaths of ten people: two women, two teenage girls, and six children. There was one survivor, an infant girl. All of the victims were shot, with a total of 19 bullets fired from two handguns at close range, most in the head, and were found in relaxed poses sitting in couches and chairs, suggesting that they had been taken by surprise.

April 15, 2010, Senate introduced bill S.3217, Restoring American Financial Stability Act of 2010.

In an incident outside a Walmart store in San Leandro, California, one man was wounded after being shot following Black Friday shopping at about 1:45 a.m.

Johnson first appeared as the character in Fast Five (2011) and helped catapult the film series into one of the top-grossing movie franchises in history.

On April 15, 2013, Facebook announced an alliance across 19 states with the National Association of Attorneys General, to provide teenagers and parents with information on tools to manage social networking profiles.

Bitcoin Core 0.12.1 was released on April 15, 2016 and enabled multiple soft forks to occur concurrently.