Main article: Articles of Confederation. The Articles of Confederation and Perpetual Union was the first constitution of the United States. It was drafted by the Second Continental Congress from mid-1776 through late-1777, and ratification by all 13 states was completed by early 1781.
In those under the age of 35 the risk is about 10% while it is about 45% in those over the age of 40. Risk begins to increase around the age of 30. About 80% of miscarriages occur in the first 12 weeks of pregnancy (the first trimester). The underlying cause in about half of cases involves chromosomal abnormalities. Other conditions that can produce similar symptoms include an ectopic pregnancy and implantation bleeding.
More than half of miscarriages in the first 13 weeks of pregnancy occur because of a problem with the baby's chromosomes. Chromosomes contain the genes that determine your baby's unique traits, such as hair and eye color.A baby can't grow normally with the wrong number of chromosomes or with damaged ones.ost miscarriages occur for reasons you have no control over. In fact, it's often difficult to pinpoint the exact cause. Learning what causes miscarriage may help put your mind at ease and help you improve your chances for having a healthy, full-term pregnancy.