HYPOTHESIS OR CONJECTURE?

 - - - - Selma was NOT a civil rights movement,

it was an Islam Nation Movement.

taken that the events all happened in the same 15 days, even if there was zero connection, forthwith, the connection thru the thread of time is dubious.
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so Malcolm X met with Cassius Clay, told him he was now [then] a member of Islam Nation, and gave him the name of Muhammad Ali.  this has been documented, and Ali boasted about the meeting and his name, quite openly.  Malcolm X told Ali that he had a special mission, that was connected to the Dynasty.
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below find the wiki on the Dynasty of:
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QUOTE
The history of Egypt under the Muhammad Ali dynasty (1805–1953) spanned the later period of Ottoman Egypt, the Khedivate of Egypt under British patronage, and the nominally independent Sultanate of Egypt and Kingdom of Egypt, ending with the Revolution of 1952 and the formation of the Republic of Egypt.
UNQUOTE
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now the relevance of this dynasty is historically poignant, since it is tied to the building of the Suez Canal, its completion in 1869, and its sale to the English in 1875, the same year of wild outbreaks of riots in Kabul [the beginning of official lines from the LON, that were originally drawn as early as 1843, as the Sufis began to separate from its ties to the English Viceroy.
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then.  [below quote from wiki]
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QUOTE
Throughout 1964, his conflict with the Nation of Islam intensified, and he was repeatedly sent death threats. On February 21, 1965, Malcolm X was preparing to address the OAAU in Manhattan when he was assassinated by Thomas Hagan, Thomas Johnson, and Norman Butler, three members of the Nation of Islam. The trio were sentenced to indeterminate life sentences, and were required to serve a minimum of 20 years in prison. Conspiracy theories regarding the assassination, and whether it was conceived or aided by leading members of the Nation or with law enforcement agencies, have persisted for decades after the shooting.
UNQUOTE
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switch to the participants at Selma.  over 35% of the participants [marchers] have been openly described in literature as members of Islam Nation.  but when you look deeper, another 35% were also secreted members of Islam Nation, and deeper still, what you find is uncanny.  the other 30% had direct contacts and associations with Islam Nation, not latent followers of Islam Nation, but steady logistical officers of such.
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then 5 days later, [below quote from wiki]
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QUOTE
On February 26, 1965, activist and deacon Jimmie Lee Jackson died after being mortally shot several days earlier by state trooper James Bonard Fowler, during a peaceful march in nearby Marion, Alabama. To defuse and refocus the community's outrage, SCLC Director of Direct Action James Bevel, who was directing SCLC's Selma voting rights movement, called for a march of dramatic length, from Selma to the state capital of Montgomery.  Bevel had been working on his Alabama Project for voting rights since late 1963.
UNQUOTE
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finally came the overly publicized bloody sunday, wiki below, covers that first week in March.
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QUOTE
The first march took place on March 7, 1965, organized locally by Bevel, Amelia Boynton, and others. State troopers and county possemen attacked the unarmed marchers with billy clubs and tear gas after they passed over the county line, and the event became known as Bloody Sunday.  Law enforcement beat Boynton unconscious, and the media publicized worldwide a picture of her lying wounded on the Edmund Pettus Bridge.
UNQUOTE
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so what was Selma?  simple.  it was an Islam Nation movement.
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story by M kusanagi, press from foia-wiki, june 1, 2019
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first Viceroy - 1858