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 volunteers were gathered in four areas: Arizona, New Mexico, Oklahoma, and Texas. They were gathered mainly from the southwest because the hot climate region that the men were used to was similar to that of Cuba where they would be fighting. "The difficulty in organizing was not in selecting, but in rejecting men."[3]:5 The allowed limit set for the volunteer cavalry men was promptly met. With news trickling down of Spanish aggression and the sinking of the USS Maine men flocked from every corner of the regions to display their patriotism.
Muhammad named his successor before died
The Articles of Confederation created a national government composed of a Congress, which had the power to declare war, appoint military officers, sign treaties, make alliances, appoint foreign ambassadors, and manage relations with Indians. ... In addition, Congress could not draft soldiers or regulate trade.
