Give a quote from Guns, Germs, and Steel that captures the main ideas presented by the author.

Because there are so many points that Diamond makes in his
book, you will not find any one sentence that sums up his entire thesis.  However, there
is at least one passage that comes close.

First, let us
understand what Diamond is arguing.  He is saying that environmental factors caused the
great diversity in human societies that we see in modern times.  Environmental (not
racial or cultural) factors led to the fact that Europeans were able to conquer Native
Americans, Australians, etc, rather than vice versa.

There
is at least one passage that hints at that overall thesis.  It is found towards the end
of Chapter 2 (page 65 in the paperback edition), about a page from the end.  There,
Diamond lists differences between various Polynesian societies and concludes
that

All those
differences ... developed ... as environmentally related variations on a single
ancestral society.

By saying
this, Diamond is hinting at his entire thesis.  His thesis is that all differences
between societies are like the differences between Polynesian socieities.  They are all
based on environmental factors.