In 1964, students poured into Mississippi to take part in the?

The Selma to Montgomery marches were three marches in 1965 that marked the political and emotional peak of the American civil rights movement. They grew out of the voting rights movement in Selma, Alabama, launched by local African-Americans who formed the Dallas County Voters League (DCVL). In 1963, the DCVL and organizers from the Student Nonviolent Coordinating Committee (SNCC) began voter-registration work. When white resistance to Black voter registration proved intractable, the DCVL requested the assistance of Martin Luther King, Jr. and the Southern Christian Leadership Conference, who brought many prominent civil rights and civic leaders to support voting rights.

The North Vietnamese Communist Party approved a "people's war" on the South at a session in January 1959 and this decision was confirmed by the Politburo in March.[15] In May 1959, Group 559 was established to maintain and upgrade the Ho Chi Minh Trail, at this time a six-month mountain trek through Laos. About 500 of the "regroupees" of 1954 were sent south on the trail during its first year of operation.[26] The first arms delivery via the trail, a few dozen rifles, was completed in August 1959.[27]

Q1: Freedom Summer.

This was a voter registration drive by the Civil Rights movement to persuade and get black voters to register to vote. Despite a raft of Civil Rights reforms, Supreme Court decisions and work the Southern states were making it hard to allow black voters to participate in elections, so the "freedom summer" was an attempt by students to kick-start the process.

Q2: The VC carried few supplies and often fought at night.

The VC used classic guerrilla warfare tactics - their objective was to hit the US soldiers in small scale ambushes, inflict some casualties and then leave quickly. Of the other choices the VC airforce was non-existent and they were militarily inferior, often using basic weaponry, and the Ho Chi Minh trail was much bombed but never destroyed. Itconsisted of a network of tracks and trails from North Vietnam to South Vietnam via Cambodia and Laos.