some lines in this thread are similar to https://www.yourdailypoem.com/listpoem.jsp?poem_id=497 This is My Song, two verses 1934 by Lloyd Stone, and a verse added later by Georgia Harkness.(info on the poets are on the daily poem page)

This Is My Song
by
Lloyd Stone and Georgia Harkness
        
Next
        

This is my song, O God of all the nations,
a song of peace for lands afar and mine;
this is my home, the country where my heart is;
here are my hopes, my dreams, my holy shrine:
but other hearts in other lands are beating
with hopes and dreams as true and high as mine.

My country’s skies are bluer than the ocean,
and sunlight beams on cloverleaf and pine;
but other lands have sunlight too, and clover,
and skies are everywhere as blue as mine:
O hear my song, thou God of all the nations,
a song of peace for their land and for mine.

May truth and freedom come to every nation;
may peace abound where strife has raged so long;
that each may seek to love and build together,
a world united, righting every wrong;
a world united in its love for freedom,
proclaiming peace together in one song.

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in youth I learned the Peace, Peace, Peace, when I learn to live serenely ... verse but not the lines A plea for one world is heard in many different lands.
This is the plea of a world that is hungry for peace.
Let all men come together.
Let us work well together,
Striving to make our world better,
Pledging our lives to peace.

what I've just heard is like two songs combined, at least the two parts have different melodies?