When you bring together unlike elements, you unify them. Political movements can unify people by inspiring them to work towards a shared goal. Likewise, a shared love of a team or band can unify people who otherwise don't have much in common.

The verb unify comes from the Latin prefix uni-, “one,” and the root facere, “to make.” When you unify things, you make them one. Often squabbling people just need someone to point out their similarities in order to unify them. If your classmates are sabotaging each other to try to win the “best-decorated locker” award, you might be able to unify their efforts suggesting a “most awesome class” award instead.

Definitions of unify
  1. verb
    join or combine
    synonyms: merge, unite
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    bring together into a single whole or system
    unite closely or intimately
    unite in one common substance
    type of:
    alter, change, modify
    cause to change; make different; cause a transformation
  2. verb
    bring or combine together or with something else
    synonyms: amalgamate, commix, mingle, mix
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    aggregate, combine
    gather in a mass, sum, or whole
    make a concoction (of) by mixing
    combine, compound
    combine so as to form a whole; mix
    blend, immingle, intermingle, intermix
    combine into one
    incorporate, integrate
    make into a whole or make part of a whole
    unitise, unitize
    make into a unit
    combine (a radio frequency wave) with a locally generated wave of a different frequency so as to produce a new frequency equal to the sum or the difference between the two
    sulfurette, sulphurette
    combine with sulfur
    mix or blend
    combine with carbon
    type of:
    alter, change, modify
    cause to change; make different; cause a transformation
  3. verb
    bring together for a common purpose or action or ideology or in a shared situation
    synonyms: unite
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    bond, bring together, draw together
    bring together in a common cause or emotion
    type of:
    alter, change, modify
    cause to change; make different; cause a transformation
  4. verb
    act in concert or unite in a common purpose or belief
    synonyms: unite
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    carve up, dissever, divide, separate, split, split up
    separate into parts or portions
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    unite to form a league
    federalise, federalize, federate
    unite on a federal basis or band together as a league
    form a confederation with; of nations
    ally with
    unite formally; of interest groups or countries
    associate, consociate
    bring or come into association or action
    band together, confederate
    form a group or unite
    reunify, reunite
    unify again, as of a country
    conjoin, espouse, get hitched with, get married, hook up with, marry, wed
    take in marriage
    couple, pair, pair off, partner off
    form a pair or pairs
    unite with a common purpose
    be or act in association with
    marry within one's own tribe or group
    marry an unsuitable partner
    marry a woman, take a wife
    take (someone) as a wife
    marry within the same ethnic, social, or family group
    marry, not for the first time
    type of:
    fall in, get together, join
    become part of; become a member of a group or organization
  5. verb
    become one
    “Germany unified officially in 1990”
    synonyms: merge, unite
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    break apart, disunify
    break up or separate
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    unite into one
    become united in substance
    syncretise, syncretize
    unite (beliefs or conflicting principles)
    come together so as to form a single product
    federalise, federalize, federate
    enter into a league for a common purpose
    fuse or cause to grow together
    clog, clot
    coalesce or unite in a mass
    type of:
    become one; become integrated
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