Why does the southern manifesto claim that the supreme court decision is a threat to constitutional government?

The Southern Manifesto is a text written in February and March 1956 by members of the United States Congress to express their opposition to racial integration in public places, and so their defense of segregation.

The document largely dealt with the historic landmark ruling by the United States Supreme Court on the segregation of public schools (Brown v. Board of Education). The first version was written by Strom Thurmond, with the final final version of Richard B. Russell. It was signed by 19 senators and 77 members of the House of Representatives, including the entire congressional delegation from the states of Alabama, Arkansas, Georgia, Louisiana, Mississippi, South Carolina and Virginia. With two exceptions, namely Republican Joel Broyhill and Richard Harding Poff of Virginia, all signatories were Southern Democrats.  

The Southern Manifesto accused the Supreme Court of "clear abuse of judicial power", thus violating the check and balances principles that are the basis of the federal government. It also stated that "all legitimate means would be used to repeal this decision, which was a contradiction to the Constitution, and would use the influence to prevent its entry into force."

the earth’s crust is broken into separate pieces called tectonic plates (fig. 7.14). recall that the crust is the solid, rocky, outer shell of the planet. it is composed of two distinctly different types of material: the less-dense continental crust and the more-dense oceanic crust. both types of crust rest atop solid, upper mantle material. the upper mantle, in turn, floats on a denser layer of lower mantle that is much like thick molten tar.

each tectonic plate is free-floating and can move independently. earthquakes and volcanoes are the direct result of the movement of tectonic plates at fault lines. the term fault is used to describe the boundary between tectonic plates. most of the earthquakes and volcanoes around the pacific ocean basin—a pattern known as the “ring of fire”—are due to the movement of tectonic plates in this region. other observable results of short-term plate movement include the gradual widening of the great rift lakes in eastern africa and the rising of the himalayan mountain range. the motion of plates can be described in four general patterns:

collision: when two continental plates are shoved together

subduction: when one plate plunges beneath another (fig. 7.15)

spreading: when two plates are pushed apart (fig. 7.15)

transform faulting: when two plates slide past each other (fig. 7.15)

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