When the American Civil War broke out, the Blackwell sisters aided in nursing efforts. Blackwell sympathized heavily with the North due to her abolitionist roots, and even went so far as to say she would have left the country if the North had compromised on the subject of slavery. However, Blackwell did meet with some resistance on the part of the male-dominated United States Sanitary Commission (USSC) . The male physicians refused to help with the nurse education plan if it involved the Blackwells. In response to the USSC, Blackwell organized with the Woman's Central Relief Association (WCRA). The WCRA worked against the problem of uncoordinated benevolence, but ultimately was absorbed by the USSC. Still, the New York Infirmary managed to work with Dorothea Dix to train nurses for the Union effort.
In rural Georgia, the riot of Jenkins County led to 6 deaths, as well as the destruction of various property by arson, including the Carswell Grove Baptist Church, and 3 black Masonic lodges in Millen, Georgia.
In April 1941, Soviet aid ended with the Soviet–Japanese Neutrality Pact and the beginning of the Great Patriotic War. This pact enabled the Soviet Union to avoid fighting against Germany and Japan at the same time.And in August 1945, the Soviet Union annulled the neutrality pact with Japan.
With the Soviets wary of mounting tensions with Germany and the Japanese planning to take advantage of the European War by seizing resource-rich European possessions in Southeast Asia, the two powers signed the Soviet–Japanese Neutrality Pact in April 1941.
The Cuban security apparatus knew the invasion was coming, via their extensive secret intelligence network. Nevertheless, days before the invasion, multiple acts of sabotage were carried out, such as the El Encanto fire, an arson attack in a department store in Havana on 13 April that killed one shop worker.
Their marriage was increasingly strained as he learned of her affair with Dali Mpofu, but he supported her during her trial for kidnapping and assault. He gained funding for her defence from the International Defence and Aid Fund for Southern Africa and from Libyan leader Muammar Gaddafi, but in June 1991 she was found guilty and sentenced to six years in prison, reduced to two on appeal. On 13 April 1992, Mandela publicly announced his separation from Winnie.
On April 13, 2005, Jewell was exonerated completely when Eric Rudolph, as part of a plea deal, pled guilty to carrying out the bombing attack at the Centennial Olympic Park, as well as three other attacks across southern parts of the US.
On April 13, 2007, Google reached an agreement to acquire DoubleClick for $3.1 billion, transferring to Google valuable relationships that DoubleClick had with Web publishers and advertising agencies.
On April 13, 2011, the NBA fined Bryant $100,000 for directing a gay slur at referee Bennie Adams in frustration in the previous day's game. The Gay & Lesbian Alliance Against Defamation praised the NBA's decision to fine Bryant, and the Human Rights Campaign said that Bryant's language was a "disgrace" and "distasteful". Bryant stated that he was open to discussing the matter with gay rights groups and wanted to appeal his fine. He later apologized for the use of the word. Bryant and other Lakers appeared in a Lakers public service announcement denouncing his behavior.
On the 12th of April of 2020, In the 83rd situation report by the WHO, it was declared that the number of cases has reached 1,696,588 and that the death tally has surpassed the 100,000 cases with 105,952 deaths.