I'm not sure 100% what exactly this question is asking, but I know World War 1 was the first war to include Gas masks and Chemical warfare, so that is more than likely the answer.
The 24th Amendment prohibited poll taxes or other taxes as qualifications for voting.
Poll taxes had been a way states had discriminated against black voters, by using their lower income status and poll taxes as a way to prevent them from going to the polls. During the civil rights movement of the 1950s and 1960s, this was challenged. The 24th Amendment, ratified in 1964, said: "The right of citizens of the United States to vote in any primary or other election for President or Vice President for electors for President or Vice President, or for Senator or Representative in Congress, shall not be denied or abridged by the United States or any State by reason of failure to pay any poll tax or other tax," and added: "The Congress shall have power to enforce this article by appropriate legislation."
The limits that human remains such as skeletons have as sources of historical information are:
- Physical condition of the bones; usually the older, the more fragile and more difficult to study.
- The completeness of the skeleton. Usually, skeletons are found incomplete for a number of reasons (anticipated decay of some bones, scavenging animals taking several bones away, etc.) and the more complete, the better.
- The information that can be extracted from bones usually limits to: a) the dead person's physical features (height, physical build, gender, etc.); b) evidence of several diseases and/or trauma (injuries breaking bones), c) facial traits (through skull forensic reconstruction) and d) racial group, diet, evidence of toxins through study of he teeth.
