Why did american indians who lived in dry areas make knives from flint rather than slate?

During world war 2 mexican workers came to the united states as part of the

If the rights to intellectual property are not sold or given away who owns the intellectual property

What role did mazzini play in italian unification? a.) he dreamed of a united italy and took the first steps to achieving it. b.) he conquered the southern part of italy, including sicily. c.) he was the first leader of a united italy. d.) he was assassinated by the french government, making him a martyr.