Answer:
a. mobile phones
Explanation:
One day some engineers decided to change the course of history. Thinking of a way to make communication more efficient and easy, they had the brilliant idea of creating a system that would be capable of communicating between cordless phones. The idea was not bad, but the technology of the time did not help much.
The real history of the mobile phone began in 1973, when the first call was made from a mobile phone to a landline. It was from April 1973 that all theories proved that the cell worked perfectly, and that the cell phone network suggested in 1947 was designed correctly. This was a not very well known moment, but it certainly was a fact marked forever because it was the moment that facilitated communication for most people through the creation of the mobile phone.
The main reason why the <span>Greeks protested against their government in 2012 was because of "austerity measures" in the economy, which many Greeks believed were making things worse rather than better. </span>
The primary way that farms in the south differed from those in the north is because the farms of the south raised cash crops using a plantation system.
Further Explanation:
In colonial America (1600-1775), slave labor was used throughout the 13 American colonies. In the North, slaves were used in industries such as shipbuilding. In the South, slaves were used for planting cash crops like tobacco, rice, and indigo.
Once America became independent and started developing its own rules, the views on slavery changed. After 1800, some states started to outlaw slavery while other states kept it. One of the biggest changes was that Southern states focused predominantly on growing one extremely important cash crop, cotton. America became the largest exporter of cotton in the world.
Despite the economic success, slavery brought with it many negative effects such as the mistreatment of African Americans, fights between abolitionists and pro slavery citizens, etc.
Ultimately, this institution would be one of the main factors in sparking the Civil War.
Learn More:
Slavery during the Civil War- brainly.com/question/9389078
Key Details:
Topic: American History
Grade Level: 7-12
Keywords: cash crop, slavery, plantation
