The southern economy was primarily agrarian (farms) while the north was heavily industrialized.
I think it was the decimal system and concept of zero
Answer:
National defence and Social security
Answer:
IT WAS FIRST USED AS A WEAPON OF MASS DESTRUCTION
AND THERE IS A SECOND USE FOR THE ZYKLON B WAS CAN ALSO BE USED AS A PESTICIDE WAS PRODUCED IN GRANULES CONSISTING OF PRUSSIC ACID.
Explanation: THIS DAY SEPT 3, 1941 ZYKLON B WAS USED AS A WEAPON OF MASS DESTRUCTION FOR THE FIRST TIME
