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The State of Illinois is a state of the United States of America, the 21st to be admitted to the Union. Chicago is the largest city in the state and the third most populous city in the United States.
In the 20th century, Illinois emerged as one of the most important states in the union with a population of nearly 5 million. By the end of the century, the population would reach 12.4 million. The Century of Progress world's fair was held at Chicago in 1933. Oil strikes in Marion County and Crawford County lead to a boom in 1937, and, by 1939, Illinois ranked 4th in U.S. oil production.
Following World War II, Argonne National Laboratory, near Chicago, activated the first experimental nuclear power generating system in United States in 1957. By 1960, the first privately financed nuclear plant in United States, Dresden 1, was dedicated near Morris. Chicago became an ocean port with the opening of the Saint Lawrence Seaway, in 1959. The seaway and the Illinois Waterway connected Chicago to both the Mississippi River and the Atlantic Ocean. In 1960, Ray Kroc opened the first McDonald's franchise in Des Plaines.
In the 1960s, Chief Petty Officer Bruce McDaniel petitioned to have the name of the state added to the flag. He noted that many of the people he served with during the Vietnam War did not recognize the banner. Governor Richard B. Ogilvie signed the addition to the flag into law on September 17, 1969 and the new flag was designed by Mrs. Sanford Hutchinson and became the official flag on July 1, 1970.[2]
The current flag depicts the Great Seal of Illinois, which was originally designed in 1819 and emulated the Great Seal of the United States. In the eagle's beak there is a banner with the state motto, "State Sovereignty, National Union." The dates on the seal, 1818 and 1868 represent the year Illinois became a state and the year in which the Great Seal was redesigned by Sharon Tyndale. Although "State Sovereignty" comes first in the motto, Illinois was recently victorious American Civil War on the Union side, fighting against state sovereignty, so Tyndale placed "State" at the bottom and "Sovereignty" upside-down.
