There are many important reasons why populations of highly developed countries decline. To number some, easy access to contraceptive method together with the a high level of female education makes birth control one important factor on population downward. Moreover, a stable economy improves lifestyle helping the population to choose professional careers thus focusing on different aspects but not making children.
On the other hand, it is important to mention that although the population in developed countries might be declining, the death rate is declining as well. As above mentioned, the lifestyle can be high and the aspects as shelter and a living space makes people healthier. Along with the economical growth comes the technological and health care advancement which greatly help the population of the developed countries to have easier and more affordable access to medical treatment making date rates lower.
The Cuban Revolution brought Fidel Castro, as a head of the 26th of July Movement (M-26-7), which initiated and lead the Revolution, to the position of the leader of Cuba, along with the communist government he was part of.
Primary source is the firsthand experience and evidence of an event, where the any given information first appeared (initial report). The secondary source uses the first source in order to give its information (for example: document that analyzes primary source documents).
When analyzing historical event a researcher use a secondary source instead of a primary source because he uses the primary source as the imput information (facts, events, dates, names) in order to analyze them, connect them and explain them in his work.
