It should be war, famine, and class struggles. I really hope this helps, let me know if you need clarification.
<u>"confirming that it is not an online source" </u>is wrong. The problem is not the fact the source is online, but if it's credible.
<u>"determining whether or not it is well-known" </u>well-known sources might still be wrong. Being known does not make something true.
<u>"d. determining whether it is a secondary source" </u>again, it has nothing at all to do with the validity of the source.
So the answer is:
b. checking its conclusions against other sources
The best way is to check the source and compare to different ones that talk about the same subject. Comparing different conclusions of different authors and seeing different points of view about the same thing is often the best way.
One of the main factors leading up to the Civil War was territorial expansion into places like Arizona and Texas, with the question being whether these new states would be free or slave. It was in Arizona's interest to side with the slave states.
<span>The Bush Doctrine - President George W. Bush brought forward a new American security strategy to prevent terrorists and dangerous regimes from developing, acquiring, or using weapons of mass destruction. The new strategy, called the Bush Doctrine, also pushed for the expansion of democracy in Middle East Muslim countries and elsewhere in the world. I Really hope this helps !</span>