For example, the average age of the onset of menstrual periods in girls was 15 in 1900. By the 1990s, this average had dropped to 12 and a half years of age.uberty facts. 1  Puberty is the period of sexual maturation and achievement of fertility. 2  The time when puberty begins varies greatly among individuals; however, puberty usually occurs in girls between the ages of 10 and 14 and between the ages of 12 and 16 in boys.
Herbert Hoover was the president of the U.S. when the great depression began in 1929.
America`s future appeared to shine brightly for most Americans when Herbert Hoover was inaugurated president in 1929. His personal qualifications and penchant for efficient planning made Hoover appear to be the right man to head the executive branch. However, the seeds of a great depression had been planted in an era of prosperity that was unevenly distributed. In particular, the depression had already sprouted on the American farm and in certain industries. The Hoover term was just months old when the nation sustained the most ruinous business collapse in its history. The stock market crashed in the fall of 1929. On just one day, October 29, frantic traders sold off 16,400,000 shares of stock.