Solution to Fill in the Blanks

Each blank can be filled in two different ways, one of which is less obvious:

ASSI(B/M)ILATE
ETHAN(A/O)L
BLIND(L/N)ESS
LIN(K/E)AGE
M(A/Y)STERIES
SIG(N/H)ERS
STRI(C/A)TURE
PATRI(O/S)TIC
TUMUL(U/T)S
TOW(N/E)LING
CONFU(T/S)ED
EMBOWE(R/L)MENT
P(Y/A)THOGENIC

This means the missing letters can spell two phrases:

BALKAN COUNTRY
MONEY HAS TESLA

The two phrases jointly point to the answer, SERBIA, which has Tesla on its currency.