The time line shows that the major way the
united states gained territory in the early 19th
century was through
(1) war (3) executive orders
(2) diplomacy (4) arbitration

its going to be mutualism cuz they both benefit from the relationship.

~batmans wife dun dun

am i too late?

explanation:

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.

a corroding iron, if that's one of your choices