<span>Complex drainage systems to keep structures from flooding this works</span>
<span>D. It was an ecological transformation.</span>
Columbian Exchange was the introduction of Old World plants and animals into the New World and the other way. An example of this was the introduction of tomatoes and potatoes to Europe.
Answer: Province Day
Explanation: Commonly known holiday in Ecuador. Next time instead of saying the question in spanish use "Spanishdict.com" to translate to English. People wouldn't understand that you are asking what they celebrate on the 12th of February in Ecuador.
(La próxima vez, diga la pregunta en inglés)
The Confederation System.
The Confederation System had a loose relationship with other political units or the states that existed within the country at the moment, such as federal governments.
Hope this helps!
Although the United States was actively involved in World War I for only nineteen months, from April 1917 to November 1918, the mobilization of the economy was extraordinary. ... Over four millionAmericans served in the armed forces, and the U.S. economyturned out a vast supply of raw materials and munitions.
