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.
The poorhouse is vanishing from among us. Hoover won the presidency that year, but his time in office belied his optimistic assertion. Within eight months of his inauguration, the stock market crashed, signifying the beginning of the Great Depression, the most severe economic crisis the United States had ever known. Rightly or wrongly, Hoover's efforts to combat the Great Depression have defined his presidency and his place in American history.