Economic Boom of 1920s By Cmeloon Period: 1912 to 1929 Electrical goods increased by 158 million Period: 1914 to 1930 Harlem population increased 115,000 Period: 1918 to 1929 Trade union membership decreased 1 million Period: 1919 to 1929 Truck registration increased 2.5 million 1920 GNP at $73.3 billion 1920 1 million Americans went camping Period: 1920 to 1929 619 commercial radio stations made Period: 1920 to 1929 Borrowing increased by $6 million Period: 1920 to 1924 Ford controls 50% of car industry Period: 1920 to 1929 1/5 of people had a car, 27 million cars being sold 1921 Federal highway act Period: 1921 to 1926 Taxes on rich lowered from 50%-20% Period: 1921 to 1932 Andrew Mellon secretary of treasury Period: 1921 to 1923 Warren Harding is president 1922 Ford McCumber tariff 1923 2000 campsites were in America 1923 Agricultural credits act Period: 1923 to 1926 Production of cars fell 400,000 Period: 1923 to 1929 Profit of businesses increased 62% Period: 1923 to 1929 Real wages increased 13% Period: 1923 to 1929 Calvin Coolidge is president 1924 Tyre manufacturing accounted for $115 million 1925 Ford makes a car every 10 seconds 1925 Federal government was in surplus of $677 million 1926 Spending of $3 billion on advertising 1927 Ford closed their factory to produce new Model A, with 60,000 workers being layed off 1928 67,000 students went to business school 1928 Only 20,000 people had freezers, which led to overproduction 1928 Only 2/435 of women were in house of representatives 1929 GNP at $104.4 billion 1929 662,000 miles of road had been built 1929 75% of cars were bought on credit 1929 50% major household appliances bought on credit 1929 Car industry employed 7% of US manufacturing workforce 1930 100 women were dentists 1930 150 women were accountants