The election of Abraham Lincoln in 1860 was the immediate cause of southern resolutions of secession. He was the nominee of the Republican party with an anti-slavery expansion platform, he refused to acknowledge the right to secession, and he would not yield federal property within Southern states.
The gestation period of a human, from time of conception to birth is approximately 9 months (266 days/38 Weeks). 9.5 months is calculated from the first day of the last menstrual period (280 days/40 Weeks).
gestation period - the period during which an embryo develops (about 266 days in humans) gestation. biological time - the time of various biological processes. full term, term - the end of gestation or point at which birth is imminent; a healthy baby born at full term. midterm - the middle of the gestation period. trimester - a period of three months; especially one of the three three-month periods into which human pregnancy is divided.