<span>The invention of rail systems made for rapid growth. Trains were used for both transport of people and consumable goods. The interstate railway was an easy way to avoid taxation over state lines and it was ruled that it was not constitutional for states to set rates on the interstate commerce.</span>
Two high tides and two low tides each day
Answer: The numeral 20
Explanation:
For the Maya, the basic unit of time, a day, was called a kin. In the second order, 20 kins made up a uinal. In a vigesimal system the third order would be 20 uinals but, instead, 18 uinals made up a tun. Thus a tun was 360 kin (days)
