Which terrorist group has been a major force in the conflicts in Iraq, Syria, and Yemen?

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The terrorist group that has been a major force in the conflicts in Iraq, Syria, and Yemen is the Islamic State of Iraq and Syria (ISIS), also known as the Islamic State of Iraq and the Levant (ISIL).

The major terrorist group that has been a significant force in the conflicts in Iraq, Syria, and Yemen is the Islamic State of Iraq and Syria (ISIS), also known as the Islamic State of Iraq and the Levant (ISIL). To find this answer, you can use various sources such as news articles, research papers, or reliable online databases. Some steps to follow to get a more detailed understanding would be:

1. Start by using credible news sources to search for information pertaining to terrorist groups involved in the conflicts in Iraq, Syria, and Yemen. Websites like CNN, BBC, Al Jazeera, and Reuters often report on global conflicts extensively.

2. Look for articles or reports specifically related to the conflicts in these countries, paying attention to those that discuss aspects such as the rise of extremist groups, their activities, and the major players.

3. Keep in mind that when exploring the topic of terrorism, it's crucial to ensure that the sources you use are reputable and unbiased. Cross-referencing information from multiple sources can help verify the accuracy and reliability of the information.

4. Look for information that specifically mentions the involvement of terrorist organizations like ISIS or ISIL in the conflicts in Iraq, Syria, and Yemen. These groups have made headlines for their involvement and have been widely reported on in the media.

By following these steps, you can gather reliable information from credible sources to identify the major terrorist group involved in the conflicts in Iraq, Syria, and Yemen as ISIS or ISIL.

Oh, my! There are more than one!

Four of the terrorist groups that have been most active since 2001 are Boko Haram, Al Qaeda, the Taliban and ISIL. These groups have been most active in Iraq, Afghanistan, Pakistan, Nigeria and Syria. 80 percent of all deaths from terrorism occurred in one of these five countries.
from https://en.wikipedia.org/wiki/Terrorism

Boko Haram is active in Africa, but the other three have been active in the Middle East. To determine how you will choose one as the "major" group, you'll need to read that article linked above, and some of the references and external links at the bottom of that article.

Let us know what you decide.