Shortage of money led to the system of barter in the colonies.
An openess. during cold war soviet union did not share anything with the rest of the world. now through glasnost Gorbachev was willing to be more honest with the world.
Mass production of steel, large suspension bridges, steel frame construction in buildings. It allowed impurities to be removed cheaply and easily, enabling steel to be produced in mass quantities.
Primary sources are important sources of unbiased historical information, and they represent the correct form and order of historical facts. primary sources such as manuscripts, letters and books such as history of Trismengitus serves to inform how the society have evolved over generations while at the same time maintaining a cause-effect correlation.
