September 6, 1901. President William McKinley is shot at the Pan American Exposition in Buffalo, NY. Anarchist Leon Czolgosz is arrested in connection with the attack. September 14, 1901. McKinley dies of complications from his bullet wounds. Vice President Theodore Roosevelt assumes the presidency.
Concrete slab. A concrete slab is a common structural element of modern buildings. Horizontal slabs of steel reinforced concrete, typically between 4 and 20 inches (100 and 500 millimeters) thick, are most often used to construct floors and ceilings, while thinner slabs are also used for exterior paving.
1 Slab â Basically a slab of concrete that your house or addition sits on. Slabs still require excavation and footers, particularly in areas like ours that get reallyeffingcold in the winter.  Crawl- In a crawl, walls are built to a depth below the frost line, but the majority of the foundation is unexcavated.