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 is the time period between conception and birth during which the embryo or foetus is developing inside the uterus. Gestation means to carry. Gestational age is calculated from the first day of the last menstrual cycle. Gestational period in a human female normally is 266 days.