Answer:
British mathematician William Bourne made some of the earliest known plans for a submarine around 1578, but the world’s first working prototype was built in the 17th century by Cornelius Drebbel, a Dutch polymath and inventor in the employ of the British King James I. Drebbel’s sub was probably a modified rowboat coated in greased leather and manned by a team of oarsmen. Sometime around 1620, he used it to dive 15 feet beneath the River Thames during a demonstration witnessed by King James and thousands of astonished Londoners. Unfortunately, none of Drebbel’s plans or engineering drawings has survived to today, so historians can only guess about how his “diving boat” actually operated. Some accounts say it submerged via a collection of bladders or wooden ballast tanks, while others suggest that a sloping bow and a system of weights were used to propel the boat underwater when it was rowed at full speed.
Explanation:
Answer:
Preserving the national security of the United States.
Promoting world peace and a secure global environment.
Maintaining a balance of power among nations.
Working with allies to solve international problems.
Explanation:
Hope this helps.
<span>Gross Domestic Product per capita</span>
Adopting a single currency is essential to having a smooth internal economy. When many states trade with different currencies within a closed environment, people who wish to buy products across boundaries have to convert currencies, which usually involves a fee.
There are three paths to becoming a united states legal citizen if you are over the age of 18. Be a permanent Citizen, Marry a Citizen but there are different rules to marrying a citizen, or Join the military. (There are certain rules to that as well) <span />
