Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
List of protests in the United States by size
Table title:
List
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 >  </th><th colspan=1 rowspan=1 > Protest </th><th colspan=1 rowspan=1 > City </th><th colspan=1 rowspan=1 > Estimated participants </th><th colspan=1 rowspan=1 > Date </th><th colspan=1 rowspan=1 > Image </th></tr>
<tr> <td colspan=1 rowspan=1 > 1 </td><td colspan=1 rowspan=1 > 2017 Women's March </td><td colspan=1 rowspan=1 > — </td><td colspan=1 rowspan=1 > 3,300,000–4,600,000 </td><td colspan=1 rowspan=1 > January 21, 2017 </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <td colspan=1 rowspan=1 > 2 </td><td colspan=1 rowspan=1 > 2018 Women's March </td><td colspan=1 rowspan=1 > — </td><td colspan=1 rowspan=1 > 1,500,000 </td><td colspan=1 rowspan=1 > January 20, 2018 </td><td colspan=1 rowspan=1 > 2018 Women's March in New York City </td></tr>
<tr> <td colspan=1 rowspan=1 > 3 </td><td class="highlighted"  colspan=1 rowspan=1 > March for Our Lives </td><td colspan=1 rowspan=1 > — </td><td colspan=1 rowspan=1 > 1,200,000-2,000,000 </td><td colspan=1 rowspan=1 > March 24, 2018 </td><td colspan=1 rowspan=1 > Protesters in Washington, D.C., 2018 </td></tr>
<tr> <td colspan=1 rowspan=1 > 4 </td><td colspan=1 rowspan=1 > March for Science </td><td colspan=1 rowspan=1 > — </td><td colspan=1 rowspan=1 > ~1,000,000 </td><td colspan=1 rowspan=1 > April 22, 2017 </td><td colspan=1 rowspan=1 > Protesters in Washington, D.C., 2017 </td></tr>
<tr> <td colspan=1 rowspan=1 > 5 </td><td colspan=1 rowspan=1 > March on Washington for Lesbian, Gay and Bi Equal Rights and Liberation </td><td colspan=1 rowspan=1 > Washington, D.C. </td><td colspan=1 rowspan=1 > 800,000–1,000,000 </td><td colspan=1 rowspan=1 > April 25, 1993 </td><td colspan=1 rowspan=1 > Demonstrators in front of the White House </td></tr>
<tr> <td colspan=1 rowspan=1 > 6 </td><td colspan=1 rowspan=1 > Anti-nuclear weapon march, part of the Nuclear Freeze campaign </td><td colspan=1 rowspan=1 > New York City </td><td colspan=1 rowspan=1 > 700,000–1,000,000 </td><td colspan=1 rowspan=1 > June 12, 1982 </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <td colspan=1 rowspan=1 > 7 </td><td colspan=1 rowspan=1 > Million Man March </td><td colspan=1 rowspan=1 > Washington, D.C. </td><td colspan=1 rowspan=1 > 670,000–800,000 </td><td colspan=1 rowspan=1 > October 16, 1995 </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <td colspan=1 rowspan=1 > 8 </td><td colspan=1 rowspan=1 > March for Women's Lives </td><td colspan=1 rowspan=1 > Washington, D.C. </td><td colspan=1 rowspan=1 > 500,000–1,000,000 </td><td colspan=1 rowspan=1 > April 25, 2004 </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <td colspan=1 rowspan=1 > 9 </td><td colspan=1 rowspan=1 > Million Mom March </td><td colspan=1 rowspan=1 > Washington, D.C. </td><td colspan=1 rowspan=1 > 750,000 </td><td colspan=1 rowspan=1 > May 14, 2000 </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <td colspan=1 rowspan=1 > 10 </td><td colspan=1 rowspan=1 > March for Life </td><td colspan=1 rowspan=1 > Washington, D.C. </td><td colspan=1 rowspan=1 > 400,000-650,000 (2013 estimate from rally organizers) </td><td colspan=1 rowspan=1 > Annually since January 22, 1974 </td><td colspan=1 rowspan=1 > 2013 march </td></tr>
<tr> <td colspan=1 rowspan=1 > 11 </td><td colspan=1 rowspan=1 > Million Woman March </td><td colspan=1 rowspan=1 > Philadelphia </td><td colspan=1 rowspan=1 > 500,000 </td><td colspan=1 rowspan=1 > October 25, 1997 </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <td colspan=1 rowspan=1 > 12 </td><td colspan=1 rowspan=1 > Moratorium to End the War in Vietnam </td><td colspan=1 rowspan=1 > Washington, D.C. </td><td colspan=1 rowspan=1 > 500,000 </td><td colspan=1 rowspan=1 > November 15, 1969 </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <td colspan=1 rowspan=1 > 13 </td><td colspan=1 rowspan=1 > People's Climate March </td><td colspan=1 rowspan=1 > New York City </td><td colspan=1 rowspan=1 > 311,000–400,000 </td><td colspan=1 rowspan=1 > September 21, 2014 </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <td colspan=1 rowspan=1 > 14 </td><td colspan=1 rowspan=1 > March on Washington for Jobs and Freedom </td><td colspan=1 rowspan=1 > Washington, D.C. </td><td colspan=1 rowspan=1 > 250,000–300,000 </td><td colspan=1 rowspan=1 > August 28, 1963 </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <td colspan=1 rowspan=1 > 15 </td><td colspan=1 rowspan=1 > Solidarity Day march </td><td colspan=1 rowspan=1 > Washington, D.C. </td><td colspan=1 rowspan=1 > 250,000–260,000 </td><td colspan=1 rowspan=1 > September 19, 1981 </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <td colspan=1 rowspan=1 > 16 </td><td colspan=1 rowspan=1 > February 15 Iraq war protests </td><td colspan=1 rowspan=1 > New York City </td><td colspan=1 rowspan=1 > 200,000–375,000 </td><td colspan=1 rowspan=1 > February 15, 2003 </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <td colspan=1 rowspan=1 > 17 </td><td colspan=1 rowspan=1 > Rally to Restore Sanity and/or Fear </td><td colspan=1 rowspan=1 > Washington, D.C. </td><td colspan=1 rowspan=1 > 215,000 </td><td colspan=1 rowspan=1 > October 30, 2010 </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <td colspan=1 rowspan=1 > 18 </td><td colspan=1 rowspan=1 > March on Washington for Lesbian and Gay Rights </td><td colspan=1 rowspan=1 > Washington, D.C. </td><td colspan=1 rowspan=1 > 200,000 </td><td colspan=1 rowspan=1 > October 11, 1987 </td><td colspan=1 rowspan=1 > Nancy Pelosi participating in the march </td></tr>
<tr> <td colspan=1 rowspan=1 > 19 </td><td colspan=1 rowspan=1 > 2015 Armenian March for Justice </td><td colspan=1 rowspan=1 > Los Angeles </td><td colspan=1 rowspan=1 > 130,000+ </td><td colspan=1 rowspan=1 > April 24, 2015 </td><td colspan=1 rowspan=1 > Armenian genocide massive march in LA.JPG </td></tr>
</table>
Question:
Which major US protests were not centralized to a specific city?
Answer:
March for Our Lives, the 2017 and 2018 Women's Marches, and the March for Science are some of the largest protests in American history without a single location.