How do third party candidates negatively impact national elections?

If you are convinced that a two party system is best for the country, then the negative impact of 3rd party candidates is that they siphon votes off of one or both of the main candidates. For instance, 3rd party candidate Ross Perot took votes away from George H. W. Bush in 1992, leading to a victory for the Democratic candidate Bill Clinton.

Others might argue, however, that 3rd party candidates are good for national elections. They raise issues for debate that might not be raised if only the two major parties were running.

in griswold v. connecticut (1965), the supreme court ruled that a state's ban on the use of contraceptives violated the right to marital privacy.

alliances in ww1 were different from ww2 because the entente in ww1 made up of serbia,russia,france,britan,japan and italy later america  and all allied in a sort of balance of power and too keep germany,austria-hungary,and the ottomans down. russia allied the serbians in order to exert its influence in the balkans while france allied the russians because france was still in dismay and insulted after the defeat to the germans during the unification of germany and britian allied the belgians after the germans invasion of belgium.in ww2 the alliances were in a preemptive attempt to deter any further wars into happening while germany and italy allied since they were insulted and humiliated after the previous war while also sharing a similar ideology of facsim along with japan which all 3 had a want for world domination and agreed to assist one another in the endevours 

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