States

States level 1

canada    = OpenStruct.new(name: "Canada", iso: "CA")
usa       = OpenStruct.new(name: "United States", iso: "US")
australia = OpenStruct.new(name: "Australia", iso: "AU")

all_countries = [
	canada,
	usa,
	australia
]

all_states = [
	bc = OpenStruct.new(name: "British Columbia", iso: "BC", fips: nil, country: canada),
	on = OpenStruct.new(name: "Ontario", iso: "ON", fips: nil, country: canada),
	qc = OpenStruct.new(name: "Quebec", iso: "QC", fips: nil, country: canada),
	og = OpenStruct.new(name: "Oregon", iso: nil, fips: "US.OR", country: usa),
	wa = OpenStruct.new(name: "Washington", iso: nil, fips: "US.WA", country: usa),
	ca = OpenStruct.new(name: "California", iso: nil, fips: "US.CA", country: usa),
	wtf = OpenStruct.new(name: "Western Australia", iso: "WA", fips: nil, country: australia)
]

state_counts = [
	OpenStruct.new(name: "BC", country: "Canada", count: 5),
	OpenStruct.new(name: "Ontario", country: "CA", count: 15),
	OpenStruct.new(name: "QC", country: nil, count: 25),
	OpenStruct.new(name: "Oregon", country: "US", count: 35),
	OpenStruct.new(name: "WA", country: "United States", count: 45),
	OpenStruct.new(name: "CA", country: nil, count: 55)
]

# Current solution
all_states.inject(Hash.new) do |memo, state|
	count = state_counts.find(name: state.name).first.count || state_counts.find(iso: state.name).first.count || 0
	memo[state.iso] = count
	memo
end

# => {bc => 5, on => 15, qc => 25, og => 35, wa => 45, ca => 55}

or (Oregon) is a reserved keyword

because all_states is an array, those assignation are unnecessary IMHO..
I just used :

all_states = [
    OpenStruct.new(name: "British Columbia", iso: "BC", fips: nil, country: canada),
    OpenStruct.new(name: "Ontario", iso: "ON", fips: nil, country: canada),
    OpenStruct.new(name: "Quebec", iso: "QC", fips: nil, country: canada),
    OpenStruct.new(name: "Oregon", iso: nil, fips: "US.OR", country: usa),
    OpenStruct.new(name: "Washington", iso: nil, fips: "US.WA", country: usa),
    OpenStruct.new(name: "California", iso: nil, fips: "US.CA", country: usa),
    OpenStruct.new(name: "Western Australia", iso: "WA", fips: nil, country: australia)
]