Short answers, pulled from the story.
Jonas Bronck arrived in New Netherland in the spring of 1639. He established the first European settlement on the mainland that would become the Bronx by building a farm called Emmaus near what is now the corner of Willis Avenue and 132nd Street in Mott Haven.
Bronx County was created as the 62nd county by the state on the 19th of April 1912. The Bronx County courts opened for business on the 2nd of January 1914, which was also the day John P. Mitchel started work as Mayor of New York City.
The population of the Bronx grew from 200,000 to 1.3 million people between 1900 and 1930. This dramatic surge occurred as rapid transit lines built their tracks into still-green fields and meadows during spurts in 1905, 1910, 1918, and 1920.
The Bronx holds the lowest number and proportion of white residents among all five boroughs. White residents declined from 99.3% in 1920 to 14.9% in 2018 while over 495,200 Black people resided there making up 35.4% of the total population.
DJ Kool Herc held parties in a community room apartment building at 1520 Sedgwick Avenue. These events took place during the 1970s when the borough was strongly associated with hip hop music development through turntablist techniques mixing scratching funk records and rapping.