Answer:
I hold two people together but touch only one. What am I?
Blade to blade I always win My foe laid low and even. Yard by yard through thick and thin I'm busiest in season.
I am a path between high natural masses; remove the first letter to get a path between man-made masses.
A large oasis in the desert. Come with cash and leave with none. What am I?
Break me but I’ll continue to work touch me and maybe I’ll stay with you forever.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.