Stable regions of the craton where shields are covered by sedimentary rocks are called platforms.
Precambrian rocks are often called basement rocks because they lie beneath a covering of fossil-bearing sedimentary strata.
Various Precambrian provinces can be delineated within the North American continent, based on radiometric ages of rocks, style of folding, and differences in trends of faults and folds.
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The main impact De Soto's expedition was disease.The Native Americans did not have any immunity to European diseases since they had never been in contact with them. The most detrimental of illness was the smallpox. They also were introduced to animals such as horses, war dogs, and pigs.
1. Made racial discrimination illegal in hotels, motels, restaurants and other places of accommodation.
2. Forbade discrimination in employment on the basis of race, color, national origin, religion or gender.
3. Provided for withholding federal grants for state and local governments and other institutions that practiced racial discrimination
