Japan invaded Manchuria in 1931 because

 

Farming in the early New England colonies was challenging because unfamiliar weather and soil conditions affected cultivation.

Jazz is a music genre that originated in the African-American communities in the early 20th century. The Jazz age occurred during 1920 - 1930 i.e, started post-World War 1 movement and ended with the Great Depression in 1929. It was the age in which jazz music and dance emerged.

In the early 20th century, the Balkans were called a "powder keg" because the political situation in the region was very unstable. For a long time, the Ottoman Turks occupied the balkans, and with the rise of nationalism, some balkan states declared independence.

Ancient rock paintings have been found in Spain and France.

Quakers are members of a group with Christian roots that began in England in the 1650s. Sir William Penn was an English nobleman, writer, early Quaker, and founder of the English North American colony the Province of Pennsylvania.

Megasthenes was an ambassador for Greek Empire.

Athenians develoed a new, much faster potter's wheel which helped pottery flourish in Athens.