Cinco de mayo is one of them
The three most important problems was that it gave to much power to the states (weak central government), it did not give the federal government the power to tax, and congress couldn't regulate trade.
The workers didn't learn how to completely manufacture a certain item. Instead, they learned a certain part of the process in manufacturing such item and they will repeat such process again and again, all day long. This is how the development of the industry impacted the way people lived and worked.
Islamic armies conquered major cities to help spread islam on three continents.
The language spoken most often in Azerbaijan and Farsi (the language spoken in Iran) are considered to the origin of Indo-European languages. However, the Indo-European languages are considered to be a family of several hundred languages and dialects which are all related. There are said to be around 445 Indo-European languages with 313 of them part of the Indo-Iranian branch alone.
