1940 - leap year

September 1939- Germany invades Poland

1938. 1939 shall not be the number, nor shall the number be 1937, excepting that the number then proceed to 1938.

1937:

1936 has a sizeable Wikipedia entry.

1935 A very popular game (no it isn't diplomacy) is introduced to people: Monopoly.

Number 1934 is pronounced one thousand nine hundred thirty four. Number 1934 is a composite number. Factors of 1934 are 2 * 967. Number 1934 has 4 divisors: 1, 2, 967, 1934. Sum of the divisors is 2904. Number 1934 is not a Fibonacci number. It is not a Bell number. Number 1934 is not a Catalan number. Number 1934 is not a regular number (Hamming number). It is a not factorial of any number. Number 1934 is a deficient number and therefore is not a perfect number. Binary numeral for number 1934 is 11110001110. Octal numeral is 3616. Duodecimal value is 1152. Hexadecimal representation is 78e. Square of the number 1934 is 3740356. Square root of the number 1934 is 43.977266854592. Natural logarithm of 1934 is 7.5673456760132 Decimal logarithm of the number 1934 is 3.286456469747 Sine of 1934 is -0.93946809962355. Cosine of the number 1934 is 0.34263638129906. Tangent of the number 1934 is -2.7418807543486.

1933 - Hitler becomes führer of Deutschland. War to follow.

1932 - FDR becomes wins the US presidential election in one of the biggest electoral college landslides ever

1931 The Japanese military stages the Mukden Incident, an explosion blamed on Chinese dissidents and used as a pretext for the Japanese invasion of Manchuria; World War II started sooner for these two countries.

1930- In january, the Moon moves into its nearest point to Earth, called perigee, at the same time as its fullest phase of the Lunar Cycle. This is the closest moon distance at 356,397 km (221,455 mi) in recent history, and the next one will be on January 1, 2257, at 356,371 km (221,439 mi).

copy pasted from wikipedia, pretty cool fact!

1929 - Sell! Sell! Sell! Holy crap the market is tanking! Sell faster!!

1928 - Invest! Invest! Invest! The market will keep booming forever!

1927... while not a prime number, it is the result of multiplying two prime numbers together.

1926 - Emperor Hirohito ascends the throne in Japan, the second of the three axis powers is now in control of their nation.

1925 - The Geneva Protocol is signed into international law.

1924- the very first Olympic Winter Games were held at the foot of Mont Blanc in Chamonix.

July 1923 – Hyperinflation in the Weimar Republic (Germany) sees the number of marks needed to purchase a single American dollar reach 353,000 – more than 200 times the amount needed at the start of the year.

1922 After their victory in the front of Afion Karahissar, Turkish forces invade Smyrna. Hundreds of women are raped, children killed or mutilated, and thousands are killed trying to escape the burning city.
No word of apology had been ever uttered by any Turkish government,

1921 might appear to be a prime number at first, but it is actually equal to 17x113.