They were made in carthage by the Phoenicians and Lydains.
Bronze
Electrum.
The first coins made by the US Mint was in 1793.
It depends on what you mean by the "first". The first known coins were Lydian, and made from electrum, a naturally occurring alloy of silver and gold that was further alloyed with added silver and copper. The first US coins were Half Cents & Cents made from solid copper.
US coins were first struck by the US mint located at Philadelphia, Pennsylvania in 1793.
Egypt, about 2000 BC
The Phoenicians and the Lydains.
They were the Lydians.
The earliest coins were made in 700-600 BC and were made out of Electrum which is a naturally occurring mix of both gold and silver. The first pure gold coins were made in about 560 BC.
US coins are not engraved, they are made with dies. The first was in 1796.
No one knows this.
The first Canadian coins were made for the Province of Canada (now Ontario and Quebec) in 1858. They were produced up until Canadian Confederation. The first coins made for the Dominion of Canada were made starting in 1870.